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Microsoft 365 vs Slack 2026: Full Comparison

Microsoft 365 is a comprehensive productivity suite with email, Office apps, and Teams collaboration, while Slack is a specialized messaging and workflow platform. Microsoft 365 offers more integrated tools under one license, whereas Slack excels as a dedicated communication hub that integrates with 2,300+ third-party apps.

Microsoft 365

Microsoft 365

Integrated productivity and collaboration suite with Office apps, email, and Teams.

Enterprises with existing Windows infrastructure, organizations needing comprehensive productivity tools, teams requiring robust email and document management

Score63%
VS
S

Slack

Cloud-based team messaging platform with 2,000+ integrations and 750,000+ active workspaces.

Tech-forward teams, startups using best-of-breed tools, organizations prioritizing communication speed and workflow automation

Score63%

Quick Answer

AI Summary

Microsoft 365 is a comprehensive productivity suite with email, Office apps, and Teams collaboration, while Slack is a specialized messaging and workflow platform. Microsoft 365 offers more integrated tools under one license, whereas Slack excels as a dedicated communication hub that integrates with 2,300+ third-party apps.

Our Verdict

AI-assisted

Choose Microsoft 365 if you need a unified productivity ecosystem with email, document creation, video conferencing, and collaboration in one platform, especially for organizations using Windows. Choose Slack if your team prioritizes streamlined messaging, rapid communication, and deep integrations with best-of-breed specialized tools across your existing tech stack.

Community feedback

Was this verdict helpful?

Microsoft 365
7/10
Slack
8/10
S
Microsoft 365

Choose Microsoft 365 if

Enterprises with existing Windows infrastructure, organizations needing comprehensive productivity tools, teams requiring robust email and document management

S

Choose Slack if

Best pick

Tech-forward teams, startups using best-of-breed tools, organizations prioritizing communication speed and workflow automation

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Key Differences at a Glance

  • Primary Function:Microsoft 365 wins(Comprehensive productivity suite (email, docs, spreadsheets, presentations, collaboration) vs Dedicated team messaging and communication platform)
  • Monthly Cost Per User (Standard Plans):Slack wins($7.25 (Slack Pro, annual billing) vs $12.50 (Microsoft 365 Business Standard))
  • Built-in Email System:Microsoft 365 wins(Yes (Outlook included) vs No (third-party integration required))
See all 7 differences

Key Facts & Figures

144 numeric metrics compared

MetricMicrosoft 365SlackRatio
Monthly Cost Per User (Entry Plan)(USD)$6
Cloud Storage Included (Basic)(GB)1,000GB (1TB)
Integrated Business Applications(applications)12+
Global Market Share(%)45-50%65%
Free Trial Period(days)30 days
Concurrent Excel Edit Capacity(users)1M+
Annual Cost (Single User)(USD)$69 (Personal) to $100 (Family)
Excel Functions Available(count)400+
Maximum Simultaneous Collaborators(users)100+
Real-Time Change Tracking Options(count)30+
Cost Per User (Monthly)(USD)$6 (Business Basic)
Cloud Storage Included(GB)1,000 GB (OneDrive)
Real-Time Collaboration Latency(milliseconds)~300 ms for co-authoring sync
Starting Monthly Cost Per User(USD)$6.00
Cloud Storage (Standard Plan)(GB)1,000 GB
Email Mailbox Capacity(GB)100 GB
Paid Users Globally(millions)60+
Maximum Team Members (Free Tier)(users)Limited to 30 days free trial
Language Support(primary languages)119
Enterprise Compliance Certifications(count)SOC 2 Type II, HIPAA, FedRAMP, ISO 27001, GDPR, CCPA
Support Response Time (Paid)(hours)1 hour (Premium Support)
Annual Cost Per User(USD)$69-$120
Microsoft Office File Compatibility(%)99% fidelity
Enterprise Security Certifications(count)SOC 2, HIPAA, GDPR, FedRAMPSOC 2 Type II, ISO 27001, FedRAMP
Typical Installation Size(MB)Web-based (minimal local footprint)
Starting Monthly Price per User(USD)$6
Premium/Advanced Tier Price(USD/month)$22 (Microsoft 365 Apps for enterprise)
Included Email Mailbox Capacity(GB)50
OneDrive Cloud Storage per User(GB)1,000
User Learning Curve (1-10 scale, 10=hardest)(scale)2-3 (intuitive Office interface)
Included Cloud Storage(GB)1,024 GB (1TB)
Simultaneous Devices(devices)5 devices per subscription
Microsoft Office File Format Compatibility(percent)99.9% native support
Supported File Formats(count)45+ major formats
Monthly Cost Per User (Standard Tier, Annual Billing)(USD)$12.50$7.25
Cloud Storage Included Per User(GB)1,000 GB (OneDrive)0 GB (integrations only)
Maximum Video Conference Participants (Standard Plan)(participants)3002
Third-Party App Integrations Available(integrations)450+2,300+
App Integrations(count)2,600+2,600+
Paid Starting Price(USD/user/mo)$7.25$7.25
Standalone Monthly Pricing (Pro Tier)(USD per user per month)$7.25$7.25
Annual Cost per User (Pro Tier)(USD)$87 (billed yearly)$87 (billed yearly)
Third-Party App Integrations(apps)2,400+2,400+
Video Meeting Capacity(participants)Up to 2,000 (with paid plan)Up to 2,000 (with paid plan)
Mobile App Feature Parity(%)95%95%
Monthly Cost per 20-Person Team(USD)$3,600 (Pro plan at $15/user)$3,600 (Pro plan at $15/user)
Free Trial Duration(days)7 days7 days
Daily Active Users Worldwide(millions)20+ million20+ million
Message History Retention on Free Plan(count)10,000 most recent10,000 most recent
Base Monthly Cost Per User(USD)$8.25 (Pro plan, min 3 users)$8.25 (Pro plan, min 3 users)
Free Tier Meeting Participant Limit(participants)Unlimited (Slack Huddles for video limited to 50 participants)Unlimited (Slack Huddles for video limited to 50 participants)
Asynchronous Communication Strength(scale 1-5)5 out of 5 (core feature with channels, threads, and history)5 out of 5 (core feature with channels, threads, and history)
Google Workspace Integration Level2 out of 5 (available via integration, not native)2 out of 5 (available via integration, not native)
AI Features Count (2026)(features)30+ (CRM tools, meeting summaries, automation, SlackBot enhancements)30+ (CRM tools, meeting summaries, automation, SlackBot enhancements)
Base Monthly Cost Per User(USD)$7.25$7.25
Business+ Tier Monthly Cost Per User(USD)$12.50$12.50
Available Integrations(integrations)2000+2000+
Price Stability (2024-2026)(months)No increases for 33 monthsNo increases for 33 months
Free Tier Cost(USD)FreeFree
Pro/Standard Monthly Cost(USD per user/month)$7.25$7.25
Third-party Integrations(integrations)2000+2000+
Minimum Monthly Cost Per User(USD)$7.25$7.25
Third-Party Integrations Available(count)2,000+2,000+
Years Price Stable (2026)(months)33+ months33+ months
Native Integrations Available(integrations)2200+2200+
Pro Plan Annual Cost(USD)$150 (billed monthly)$150 (billed monthly)
Free Tier Message History Retention(days)90 days90 days
AI Transcription Languages Supported(languages)0 (not native feature)0 (not native feature)
Enterprise Uptime SLA(percent)99.99%99.99%
User Workspace Limit (Free Tier)(workspaces)1 workspace1 workspace
Maximum Meeting Participants (Free)(participants)3 participants3 participants
Pro Plan Monthly Cost (Annual Billing)(USD per user)$8.75$8.75
Available Integrations(count)2,400+2,400+
Monthly Cost (Pro Plan)(USD)$12.50 per user/month$12.50 per user/month
Free Message History(days)90 days maximum90 days maximum
Voice Audio Codec Quality(kHz)16 kHz16 kHz
Third-Party Integrations(integrations)2000+ integrations2000+ integrations
Maximum Video Call Participants(people)15 participants15 participants
Total Registered Users(millions)750 million750 million
Enterprise Plan Monthly Cost Per User(USD)$12.50$12.50
Free Plan Message History Retention(days)90 days90 days
Third-Party Integrations Available(count)2,300+ integrations2,300+ integrations
Paid Plan Starting Price(USD/month)$7.25$7.25
Cloud Storage (Base Plan)(GB)10 GB10 GB
Monthly Cost Per User(USD)$8-12.50 (Pro/Business+)$8-12.50 (Pro/Business+)
Active Workspaces(workspaces)750,000+750,000+
Message History Searchable(years)10 years standard10 years standard
Workflow Automation Steps(built-in steps)50+50+
Native App Integrations Available(count)2,400+ apps2,400+ apps
Monthly Cost (Pro Plan, 50 users)(USD)$412.50/month$412.50/month
Paid Workspaces/Users (Enterprise Adoption)(workspaces)750,000+ paid workspaces750,000+ paid workspaces
Monthly Cost (10 Users, Annual)(USD)$150/month ($1,800/year)$150/month ($1,800/year)
Pre-built Integrations(operators)2,400+ integrations2,400+ integrations
Message History on Free Plan(days)90-day limited access90-day limited access
Active Global Workspaces/Deployments(count)750,000+ active workspaces750,000+ active workspaces
Uptime SLA Guarantee(percentage)99.99%99.99%
Price Per User Per Month (Pro/Standard)(USD)$12.50/user (Pro plan)$12.50/user (Pro plan)
Base Monthly Cost (10-person team)(USD)$80-150$80-150
Cost for 50-person team(USD/month)$400-750$400-750
Real-time Messaging Speed(ms (message delivery latency))50-100ms (instant)50-100ms (instant)
File Storage Included(GB)5GB (Free), varies by plan5GB (Free), varies by plan
Setup Time for New Team(hours)0.5-1 hour0.5-1 hour
Max Video Conference Participants(people)10001000
Voice Codec Quality Rating(score (1-10))7.57.5
Time to Deploy(hours)3-73-7
Uptime Guarantee(percent)99.99%99.99%
Pro Plan Monthly Cost(USD)$8.75$8.75
Video Conference Max Participants(participants)150150
Free Tier File Storage(GB per user)1 GB shared workspace1 GB shared workspace
Message Search History (Free Tier)(days)90 days90 days
Annual Subscription Cost (Pro, 100 users)(USD)$10,500$10,500
Desktop App Memory Usage(MB)280 MB280 MB
Monthly subscription cost (Pro plan)(USD per user)$12.50$12.50
Native third-party integrations(count)100+100+
Message Search Response Time(seconds)2-4 seconds2-4 seconds
User interface satisfaction rating(out of 10)9.2/109.2/10
Maximum video call participants (free tier)(people)100 participants100 participants
Service uptime SLA guarantee(percent)99.99%99.99%
Message history retention (free plan)(days)90 days searchable90 days searchable
Enterprise app marketplace size(applications)2,000+ apps (Slack App Directory)2,000+ apps (Slack App Directory)
Team Size Cost Efficiency Threshold(team members)Cost-effective until ~12 usersCost-effective until ~12 users
Message History Searchability(months)90 days (Free/Pro), unlimited with Enterprise90 days (Free/Pro), unlimited with Enterprise
Average User Adoption Time(days)1-3 days1-3 days
Global Active Users(millions)750+ million messages daily across 750k+ organizations750+ million messages daily across 750k+ organizations
Monthly Subscription Cost (Pro/Standard)(USD)$8.25$8.25
Message Delivery Latency(milliseconds)<100ms<100ms
File Upload Limit(GB)20GB20GB
Message History Retention (Free Tier)(days)90 days90 days
G2 Ease of Use Rating (2024)(stars)4.5/54.5/5
Video Meeting Participant Limit(participants)20002000
Pro Plan Monthly Cost Per User(USD)$12.50$12.50
File Storage Per User(GB)100 (workspace)100 (workspace)
Free Group Video Call Duration Limit(minutes)4040
Maximum Video Conference Participants (Free)(people)Limited (typically 3-4)Limited (typically 3-4)
G2 User Interface Rating(out of 5)4.6/5 (12,400 reviews)4.6/5 (12,400 reviews)
Daily Active Users(millions)21 million21 million
Message History (Free Plan)(days)90 days90 days
Cost Per User (Annual, Lowest Paid Tier)(USD/month)$8/month$8/month
Organizations Using Platform(count (thousands))750,000+750,000+
Message Search History(messages)10,000 (free tier); unlimited (paid)10,000 (free tier); unlimited (paid)
Base Cost per User/Month(USD)$8.99$8.99
Native Integrations(count)2,000+2,000+
Active Workspaces/Deployments(count)750,000750,000
iOS App Rating(stars)4.74.7

Sourced from publicly available data ·

Key Differences

7 attributes compared head-to-head

Microsoft 365
5Microsoft 365
Microsoft 365 leads
S
2Slack
  • Primary Function

    Microsoft 365

    Comprehensive productivity suite (email, docs, spreadsheets, presentations, collaboration)(winner)

    Slack

    Dedicated team messaging and communication platform

  • Monthly Cost Per User (Standard Plans)

    Microsoft 365

    $12.50 (Microsoft 365 Business Standard)

    Slack

    $7.25 (Slack Pro, annual billing)(winner)

  • Built-in Email System

    Microsoft 365

    Yes (Outlook included)(winner)

    Slack

    No (third-party integration required)

  • Third-Party App Integrations

    Microsoft 365

    450+ native integrations

    Slack

    2,300+ available integrations(winner)

  • Cloud Storage Per User

    Microsoft 365

    1 TB (OneDrive)(winner)

    Slack

    File sharing via third-party apps

  • Video Conferencing Participants (Free Plan)

    Microsoft 365

    300 participants (Teams)(winner)

    Slack

    Not available (Slack Calls limited to direct messages)

  • Message Search History (Free Plan)

    Microsoft 365

    Unlimited search in Outlook(winner)

    Slack

    Last 90 days only

Full Comparison

Microsoft 365
SSlack
Monthly Cost (Standard Tier)(USD/user/month)
$12.50
Monthly Cost Per User (Entry Plan)(USD)
$6
Annual Cost (Single User)(USD)
$69 (Personal) to $100 (Family)
Cost Per User (Monthly)(USD)
$6 (Business Basic)
Starting Monthly Cost Per User(USD)
$6.00
Show 34 more attributes
Annual Cost Per User(USD)
$69-$120
Starting Monthly Price per User(USD)
$6
Premium/Advanced Tier Price(USD/month)
$22 (Microsoft 365 Apps for enterprise)
Monthly Cost Per User (Standard Tier, Annual Billing)(USD)
$12.50
$7.25
Standalone Monthly Pricing (Pro Tier)(USD per user per month)
$7.25
Annual Cost per User (Pro Tier)(USD)
$87 (billed yearly)
Monthly Cost per 20-Person Team(USD)
$3,600 (Pro plan at $15/user)
Base Monthly Cost Per User(USD)
$8.25 (Pro plan, min 3 users)
Base Monthly Cost Per User(USD)
$7.25
Business+ Tier Monthly Cost Per User(USD)
$12.50
Price Stability (2024-2026)(months)
No increases for 33 months
Free Tier Cost(USD)
Free
Pro/Standard Monthly Cost(USD per user/month)
$7.25
Minimum Monthly Cost Per User(USD)
$7.25
Years Price Stable (2026)(months)
33+ months
Pro Plan Annual Cost(USD)
$150 (billed monthly)
Pro Plan Monthly Cost (Annual Billing)(USD per user)
$8.75
Monthly Cost (Pro Plan)(USD)
$12.50 per user/month
Enterprise Plan Monthly Cost Per User(USD)
$12.50
Paid Plan Starting Price(USD/month)
$7.25
Monthly Cost Per User(USD)
$8-12.50 (Pro/Business+)
Monthly Cost (Pro Plan, 50 users)(USD)
$412.50/month
Monthly Cost (10 Users, Annual)(USD)
$150/month ($1,800/year)
Price Per User Per Month (Pro/Standard)(USD)
$12.50/user (Pro plan)
Base Monthly Cost (10-person team)(USD)
$80-150
Cost for 50-person team(USD/month)
$400-750
Pro Plan Monthly Cost(USD)
$8.75
Annual Subscription Cost (Pro, 100 users)(USD)
$10,500
Monthly subscription cost (Pro plan)(USD per user)
$12.50
Team Size Cost Efficiency Threshold(team members)
Cost-effective until ~12 users
Monthly Subscription Cost (Pro/Standard)(USD)
$8.25
Pro Plan Monthly Cost Per User(USD)
$12.50
Cost Per User (Annual, Lowest Paid Tier)(USD/month)
$8/month
Base Cost per User/Month(USD)
$8.99
Global Paid Seats (2026)(millions)
446M
Active Workspaces(workspaces)
750,000+
Active Workspaces/Deployments(count)
750,000
Market Share(percentage)
~58%
Global Market Share(%)
45-50%
65%
Paid Users Globally(millions)
60+
AI Assistant Availability
Copilot (premium only)
AI Assistant Integration
Copilot included (most plans)
AI Assistant Capability
Slack AI (optional on paid plans)
AI Transcription Languages Supported(languages)
0 (not native feature)
AI Meeting Assistant
Slack AI (search, summarization, drafting)
IT Management Burden(user satisfaction)
Complex enterprise setup
Desktop App Integration
Full Office suite included
Integrated Business Applications(applications)
12+
Native CRM Included
No (Dynamics 365 separate)
Excel Functions Available(count)
400+
Real-Time Change Tracking Options(count)
30+
Show 39 more attributes
Database Relations Support(capability)
Basic lookup fields in Excel
Native Email Functionality(yes/no)
Yes (Outlook with 50 GB inbox)
Built-in AI Features
Copilot (separate $20/month add-on)
Cloud Storage (Standard Plan)(GB)
1,000 GB
Email Mailbox Capacity(GB)
100 GB
Office Suite (Word, Excel, PowerPoint) Included(null)
Yes (all included)
Simultaneous Devices(devices)
5 devices per subscription
Cloud Storage Included Per User(GB)
1,000 GB (OneDrive)
0 GB (integrations only)
Maximum Video Conference Participants (Standard Plan)(participants)
300
2
Message Search History Retention (Free Plan)(days)
Unlimited
App Integrations(count)
2,600+
Video Meeting Capacity(participants)
Up to 2,000 (with paid plan)
Native Office Integration
Limited (third-party connectors)
AI Copilot Features
Slack AI (summarization, search, assisted writing)
Message History Retention on Free Plan(count)
10,000 most recent
Free Tier Meeting Participant Limit(participants)
Unlimited (Slack Huddles for video limited to 50 participants)
Native Video Conferencing
Huddles for brief video, limited to 50 participants; requires external tool for full conferencing
Meeting Recording & Auto-Transcription
Not native; requires integration with Otter.ai or similar third-party services
Asynchronous Communication Strength(scale 1-5)
5 out of 5 (core feature with channels, threads, and history)
Third-Party Integrations Available(count)
2,000+
Enterprise AI Features
Advanced AI assistant, smart summaries, automation
Native Integrations Available(integrations)
2200+
Free Message History(days)
90 days maximum
Third-Party Integrations(integrations)
2000+ integrations
Free Plan Message History Retention(days)
90 days
Free Plan External Guest Collaboration(capacity)
Unlimited external guests via workspace invite
Email Service Included
No
Message History Searchable(years)
10 years standard
Workflow Automation Steps(built-in steps)
50+
Pre-built Integrations(operators)
2,400+ integrations
Message History on Free Plan(days)
90-day limited access
Message History Retention(status)
10,000 messages (free); unlimited (paid)
Built-in Project Management(status)
No (requires integrations)
Max Video Conference Participants(people)
1000
Video Conference Max Participants(participants)
150
Message Search History (Free Tier)(days)
90 days
Message Search Speed (Free Tier)(indexing scope)
All messages indexed instantly
Message History Retention (Free Tier)(days)
90 days
Video Meeting Participant Limit(participants)
2000
Real-Time Collaboration Speed(relative rating)
Comprehensive, moderate
Real-Time Collaboration Latency(milliseconds)
~300 ms for co-authoring sync
Typical Installation Size(MB)
Web-based (minimal local footprint)
Real-time Data Refresh (Premium)(seconds)
Not available
Message Search Speed(seconds)
Excellent - optimized search indexing
Show 6 more attributes
Voice Audio Codec Quality(kHz)
16 kHz
Maximum Video Call Participants(people)
15 participants
Real-time Messaging Speed(ms (message delivery latency))
50-100ms (instant)
Desktop App Memory Usage(MB)
280 MB
Message Search Response Time(seconds)
2-4 seconds
Message Delivery Latency(milliseconds)
<100ms
Enterprise Security (Intune/Advanced Tools)
Industry-leading with Intune E3/E5
SSO (Single Sign-On) Availability
Standard in Business plans ($6+/user)
Enterprise Compliance Certifications(count)
SOC 2 Type II, HIPAA, FedRAMP, ISO 27001, GDPR, CCPA
Enterprise Security Certifications(count)
SOC 2, HIPAA, GDPR, FedRAMP
SOC 2 Type II, ISO 27001, FedRAMP
GDPR & Data Sovereignty Compliance
Compliant but data on Salesforce servers
Show 2 more attributes
End-to-End Encryption Available
DMs only, Enterprise+ plan
End-to-End Encryption Default
Not available
Cloud Storage Included (Basic)(GB)
1,000GB (1TB)
Cloud Storage Included(GB)
1,000 GB (OneDrive)
OneDrive Cloud Storage per User(GB)
1,000
Included Cloud Storage(GB)
1,024 GB (1TB)
Storage Per User (Standard Plan)(GB)
Variable by plan
Show 6 more attributes
Cloud Storage (Base Plan)(GB)
10 GB
File Storage Included(GB)
5GB (Free), varies by plan
Free Tier File Storage(GB per user)
1 GB shared workspace
Message history retention (free plan)(days)
90 days searchable
File Upload Limit(GB)
20GB
File Storage Per User(GB)
100 (workspace)
Free Trial Period(days)
30 days
Free Trial Duration(days)
7 days
Concurrent Excel Edit Capacity(users)
1M+
Maximum Simultaneous Collaborators(users)
100+
Real-Time Co-Authoring Support
Yes (unlimited simultaneous users)
Included Email Mailbox Capacity(GB)
50
Supported Operating Systems
Windows, macOS, iOS, Android, Web
Microsoft Office File Compatibility(%)
99% fidelity
Available Platforms
Windows, Mac, iOS, Android, Web
Microsoft Office File Format Compatibility(percent)
99.9% native support
Supported File Formats(count)
45+ major formats
Offline Editing Capability
Full support
Maximum Meeting Participants(participants)
Unlimited group chats
Built-in Task Management(features)
No: messaging-only, requires integrations
Message History Searchability(months)
90 days (Free/Pro), unlimited with Enterprise
Enterprise Active Directory Integration
Yes, native support
Maximum Team Size Per Plan(users)
Unlimited (per subscription)
Maximum Team Members (Free Tier)(users)
Limited to 30 days free trial
Users Per Workspace(count)
Unlimited
Offline Desktop Editing(yes/no)
Yes (full Office suite offline)
Mobile Platform Support(platforms)
iOS, Android, Windows Phone
Language Support(primary languages)
119
Third-Party App Integrations Available(integrations)
450+
2,300+
Available Integrations(integrations)
2000+
Support Response Time (Paid)(hours)
1 hour (Premium Support)
AI-Powered Features(count)
Copilot, Designer, smart suggestions
Data Sources Supported(count)
20+ (via Excel integrations)
Third-Party App Integrations(apps)
2,400+
Google Workspace Native Integration
Limited (requires custom setup)
Native third-party integrations(count)
100+
Native Microsoft 365 Integration(integration level)
API-based (basic)
Average Dashboard Creation Time(hours)
4-8 (without Power BI)
User Learning Curve (1-10 scale, 10=hardest)(scale)
2-3 (intuitive Office interface)
Setup Time for New Team(hours)
0.5-1 hour
Paid Starting Price(USD/user/mo)
$7.25
Mobile App Feature Parity(%)
95%
Mobile App Type
Native iOS/Android with feature-parity
Daily Active Users Worldwide(millions)
20+ million
Self-Hosting Available(boolean)
No
Self-Hosted/On-Premises Option
No (cloud-only)
Google Workspace Integration Level
2 out of 5 (available via integration, not native)
AI Features Count (2026)(features)
30+ (CRM tools, meeting summaries, automation, SlackBot enhancements)
Deployment Options
Cloud-based SaaS only
Deployment Options(types)
Cloud SaaS only
Third-party Integrations(integrations)
2000+
Available Integrations(count)
2,400+
Third-Party Integrations Available(count)
2,300+ integrations
Native Integrations(count)
2,000+
AI Features (2026)
Workflow automation, search enhancement
Real-Time Translation
Not available
Asynchronous Communication
Optimized with threads and archives
Zoom Rooms Cost(USD per room/month)
N/A
Workflow Automation Complexity
Advanced with conditional logic
Open Source
No, proprietary
Maximum Video Length (Free Tier)(minutes)
N/A
Maximum Video Resolution(pixels)
Requires 3rd party
Free Tier Message History Retention(days)
90 days
Enterprise Uptime SLA(percent)
99.99%
Uptime SLA Guarantee(percentage)
99.99%
Uptime Guarantee(percent)
99.99%
Service uptime SLA guarantee(percent)
99.99%
User Workspace Limit (Free Tier)(workspaces)
1 workspace
Maximum Meeting Participants (Free)(participants)
3 participants
Maximum Meeting Participants (Paid)(participants)
Unlimited (slide deck view only)
Free Plan Message History(months)
90 days
FedRAMP Authorization(boolean)
No
HIPAA Compliance Certified
Yes (Business+ plan required)
SOC 2 Type II Certified
Yes
Custom Workflow Automation
Advanced (Workflow Builder, automations)
Total Registered Users(millions)
750 million
Daily Posts Published (Organic)(millions)
N/A
Threading Model
Channel-based threads (contextual loss in active channels)
Open Source
Proprietary (closed-source)
Native Video/Audio Calls
Yes (Slack Huddles)
Native App Integrations Available(count)
2,400+ apps
Paid Workspaces/Users (Enterprise Adoption)(workspaces)
750,000+ paid workspaces
Active Global Workspaces/Deployments(count)
750,000+ active workspaces
Source Code Availability
Proprietary/closed
Voice Codec Quality Rating(score (1-10))
7.5
Time to Deploy(hours)
3-7
Learning Curve(hours to proficiency)
2
Monthly Active Users(millions)
0.75 million
User interface satisfaction rating(out of 10)
9.2/10
Average User Adoption Time(days)
1-3 days
G2 Ease of Use Rating (2024)(stars)
4.5/5
G2 User Interface Rating(out of 5)
4.6/5 (12,400 reviews)
iOS App Rating(stars)
4.7
Maximum video call participants (free tier)(people)
100 participants
Free Group Video Call Duration Limit(minutes)
40
Maximum Video Conference Participants (Free)(people)
Limited (typically 3-4)
Enterprise app marketplace size(applications)
2,000+ apps (Slack App Directory)
Global Active Users(millions)
750+ million messages daily across 750k+ organizations
Message Search Capability(text)
Full-text indexed across all messages
Daily Active Users(millions)
21 million
End-to-End Encryption
Partial (DMs only, beta feature)
Message History (Free Plan)(days)
90 days
Message Search History(messages)
10,000 (free tier); unlimited (paid)
Self-Hosting Capability
Not available
Organizations Using Platform(count (thousands))
750,000+
GDPR Compliance
Certified (SOC 2 Type II, GDPR)
GitHub Stars (Community)(stars)
N/A (proprietary)

Pros & Cons

10 pros·6 cons across both

Microsoft 365
S
Microsoft 365

Microsoft 365

+5-3

Pros

  • Includes Outlook email with full Exchange integration
  • 1 TB OneDrive cloud storage per user included
  • Teams video conferencing supports up to 300 participants
  • Office apps (Word, Excel, PowerPoint) with real-time co-authoring
  • Seamless Windows and Active Directory integration

Cons

  • Higher price point ($12.50/user/month) than Slack at scale
  • Teams chat interface less intuitive than Slack for notification management
  • Smaller third-party integration ecosystem (450 vs Slack's 2,300)
S

Slack

+5-3

Pros

  • Lower cost ($7.25/user/month annual) with affordable free tier
  • 2,300+ app integrations for custom workflows and automation
  • Superior user interface designed specifically for chat and collaboration
  • Powerful search and threading keep conversations organized
  • Works seamlessly across Windows, Mac, Linux, iOS, Android

Cons

  • Free plan limits message history to last 90 days
  • Requires separate tools for email, video conferencing, document storage
  • No built-in video conferencing; depends on third-party integration (Zoom, Google Meet)

Frequently Asked Questions

5 questions

  1. Slack cannot fully replace Microsoft 365 because it lacks email, document creation (Word/Excel/PowerPoint), and robust video conferencing. However, you can integrate Slack with Google Workspace or Microsoft 365 to use Slack for communication while maintaining your productivity tools. Many companies use both together rather than one replacing the other.

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