Want to connect Slack and Microsoft Teams so your teams can message each other without switching apps? You've come to the right place.
This step-by-step guide covers everything you need to know about bridging Slack and Teams in 2025 — what's possible, what's not, and the fastest path to real bidirectional messaging sync.
Can Slack and Microsoft Teams Talk to Each Other Natively?
Short answer: No. As of 2025, Slack and Microsoft Teams have no native interoperability. There is no built-in way to send a message from Slack and have it appear in Teams (or vice versa) without a third-party integration layer.
The production-ready solution is an enterprise interoperability platform like SyncRivo.
The 3 Common Approaches (And Why 2 of Them Fall Short)
Option 1: Guest Accounts ❌
Create guest accounts in Teams for Slack users (and vice versa).
Why it fails:
- Every Slack user needs a Teams license — expensive at scale
- Employees must constantly switch between apps
- IT has to manage two identity stacks
- Guest access creates compliance and data governance risks
Option 2: Email Forwarding or Bots ❌
Use a notification bot that emails important messages across platforms.
Why it fails:
- One-way only — no real bidirectionality
- Loses all context: threading, sender identity, file attachments
- Latency is minutes or hours, not milliseconds
- Not scalable beyond a handful of channels
Option 3: Messaging Interoperability Platform (SyncRivo) ✅
A dedicated API-to-API bridge that routes messages between Slack and Teams in real time.
Why it works:
- True bidirectional sync — messages flow in both directions
- Full fidelity — threading, sender names, files, @mentions preserved
- Real time — messages typically arrive within seconds
- BAA available for Enterprise customers
- No guest accounts, no app switching
How to Connect Slack and Microsoft Teams Using SyncRivo
Step 1: Book a Demo
Go to syncrivo.ai/pricing and book a demo. SyncRivo sets up a guided pilot on your own channels, with dedicated onboarding support.
Step 2: Authorize Slack
In the SyncRivo dashboard:
- Click Add Platform → Slack
- Sign in with your Slack Workspace Admin account
- Approve the SyncRivo app install (the Slack consent page lists the full set of scopes)
Step 3: Authorize Microsoft Teams
- Click Add Platform → Microsoft Teams
- Sign in with your Azure Active Directory admin account
- Grant admin consent for the SyncRivo Enterprise App in your tenant
Admin consent required: the Microsoft consent screen lists the permissions. After consent, install the SyncRivo app to each team whose channels you will bridge.
This step requires Microsoft 365 Global Admin or Teams Service Admin permissions.
Step 4: Map Your Channels
In the SyncRivo dashboard, navigate to Channel Mappings:
- Select the Slack channel you want to sync (e.g.,
#engineering-general) - Select the Teams channel to pair it with (e.g.,
Engineering > General) - Bridges are bidirectional — messages flow both ways
- Click Save & Activate
Repeat for each channel pair you want to bridge.
Step 5: Test the Connection
Post a test message in your Slack channel. Within seconds, it should appear in the paired Teams channel — with your name shown on the message and any thread context preserved.
Send a reply from Teams. It should appear in Slack within seconds as well.
What Gets Synced Between Slack and Teams
| Element | Synced |
|---|---|
| Text messages | ✅ |
| Thread replies | ✅ |
| File attachments | ✅ (as links) |
| Sender name | ✅ (Slack still shows an APP label; Teams channel posts come from the app) |
| @mentions | ✅ (mapped) |
| Emoji reactions | ✅ (limited on Teams) |
| Message edits | ✅ |
| Message deletions | ✅ |
Compliance: Is This Secure?
SyncRivo does not store message content on the normal relay path. Messages are:
- Received from the Slack Events API or the SyncRivo Teams app
- Processed and reformatted
- Delivered to the destination API
- Not stored — only message IDs are kept, so threads, edits, and reactions stay in sync (an optional retry queue temporarily holds undelivered messages)
Traffic is encrypted in transit with TLS, and provider OAuth tokens are encrypted at rest. SyncRivo does not currently hold a SOC 2 report; we provide a security questionnaire and architecture review on request. A BAA is available for Enterprise customers in healthcare.
Ready to Connect Slack and Microsoft Teams?
Your first channel bridge is typically live during onboarding, once your Slack and Teams admins approve the app. No migration. No guest accounts.
→ See the dedicated Slack to Microsoft Teams integration page → View SyncRivo pricing → Explore all features → Also read: The Complete Guide to Enterprise Messaging Interoperability → Also read: Slack vs Microsoft Teams Enterprise (2025 Comparison)
Written by SyncRivo Team · March 5, 2025
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