Microsoft Teams Not Showing Outlook Calendar Meetings

One of the most common Microsoft Teams issues reported by UK business users is the Calendar tab showing no meetings, or meetings appearing in Outlook but not in Teams. Because Teams and Outlook share the same Microsoft 365 Exchange calendar, the cause is almost always a sync or configuration issue rather than missing meetings. The good news is that most cases can be resolved in a few minutes without needing to contact your IT helpdesk. Work through the fixes below in order — the simpler checks come first.

Confirm the Accounts Match

Before trying anything else, confirm you are signed into the same Microsoft 365 account in both Teams and Outlook. If your organisation uses multiple domains, or you have both a personal Microsoft account and a work account on the same device, a mismatch here is the single most common cause of calendar sync failures.

• In Teams: click your profile picture in the top-right corner — the email address shown is the active account.
• In Outlook: go to File → Account Information and check the email address listed under your Exchange account.

If the accounts differ, sign out of one application and sign back in with the correct work credentials before continuing.

[Screenshot: Teams profile menu showing active account email address]

Fix 1: Restart Teams

A straightforward restart resolves the majority of temporary sync failures. Teams runs as a background process even after you close the window, so a proper quit is required.

Right-click the Teams icon in the system tray (bottom-right of the taskbar, near the clock) and select Quit. Once Teams has fully closed, reopen it from the Start menu or desktop shortcut. Wait approximately two minutes for the Calendar tab to populate from Exchange. In most cases, this alone is enough to restore missing meetings.

Fix 2: Clear the Teams Cache

If a restart does not help, clearing the local Teams cache forces the application to re-fetch all data directly from Microsoft 365, including your calendar.

1. Fully quit Teams as described above.
2. Press Windows key + R, type %AppData%MicrosoftTeams and press Enter.
3. Inside this folder, open the Cache folder and delete all its contents.
4. Return to the Teams folder and open the databases folder — delete its contents as well.
5. Restart Teams and allow a couple of minutes for the Calendar to reload.

This process does not delete any messages, files, or meeting content — those are stored in the cloud. You may need to sign back in after clearing the cache.

[Screenshot: Windows Explorer showing %AppData%MicrosoftTeams folder with Cache subfolder highlighted]

Fix 3: Check the Outlook Teams Meeting Add-in

If meetings you create in Outlook are not appearing in Teams, the Microsoft Teams Meeting add-in for Outlook may have been disabled — either automatically after an update or manually by a previous user.

1. Open Outlook and go to File → Options → Add-ins.
2. At the bottom of the window, ensure the dropdown reads COM Add-ins and click Go.
3. Look for Microsoft Teams Meeting Add-in for Microsoft Office in the list.
4. If the checkbox is unticked, tick it and click OK.
5. Restart Outlook. A Teams Meeting button should now appear when creating a new calendar event.

If the add-in does not appear in the list at all, it may need to be repaired or reinstalled — this is covered under the escalation steps at the end of this guide.

[Screenshot: Outlook COM Add-ins dialog with Microsoft Teams Meeting Add-in checkbox ticked]

Fix 4: Check Exchange Mailbox Connectivity

Microsoft Teams Calendar works exclusively with Exchange Online — the cloud-hosted mailbox that is part of Microsoft 365. If your organisation uses a hybrid Exchange setup (some mailboxes on-premises, some in the cloud), Teams may not display calendar events correctly unless your specific mailbox has been migrated to Exchange Online.

This is a relatively common scenario in UK businesses that have partially migrated to Microsoft 365 and retained an on-premises Exchange server. If you are unsure whether your mailbox is on Exchange Online or on-premises, check with your IT administrator. This particular issue cannot be resolved by the end user and requires administrator-level changes to your Exchange configuration.

Fix 5: Re-sign into Teams

Signing out and back into Teams refreshes the underlying Exchange connection and clears any authentication token issues that may be preventing calendar sync.

Click your profile picture in Teams, select Sign out, then sign back in using your work account credentials (your company email address and Microsoft 365 password). Once signed in, navigate to the Calendar tab and check whether your meetings have appeared.

Fix 6: Check for Teams Updates

An outdated Teams client can carry unresolved bugs — including calendar sync issues that have been patched in more recent versions.

Click your profile picture in Teams and select Check for updates. Teams will download and apply any available updates in the background. You will see a notification when updates are ready; restart Teams to complete the installation.

Teams on Windows updates automatically in most cases, but update delivery can occasionally be delayed on managed corporate devices where IT policy controls the rollout schedule.

Meetings Showing in Teams but Not Outlook

This reverse problem is less common but worth addressing. It is typically caused by Teams having been configured to create meetings against a different Exchange account than the one Outlook is displaying — for example, if you have multiple Microsoft accounts on the same device.

Return to the account alignment check at the top of this guide. Sign out of Teams, confirm which account Outlook is using, and sign back into Teams with the same account. Meetings created after this change should appear in both applications.

When to Escalate to IT

If none of the fixes above have resolved the issue, the underlying cause is likely one that requires administrator access to investigate. Common administrator-level causes include:

• Mailbox permission issues — delegate access or shared mailbox configurations that interfere with calendar sync.
• Exchange hybrid configuration — as mentioned above, mailboxes not yet migrated to Exchange Online will not sync with Teams Calendar.
• Conditional access or compliance policies — some Microsoft 365 tenant security settings can block Teams from accessing calendar data, particularly on unmanaged or personal devices.
• Licensing issues — Teams Calendar requires an appropriate Microsoft 365 licence (Business Basic, Business Standard, or equivalent). Free Teams accounts do not include full Exchange integration. Your IT administrator can confirm your licence assignment in the Microsoft 365 admin centre.

When raising a support ticket, note which fixes you have already attempted, whether the issue affects other users in your organisation, and whether the problem started after a recent Teams or Windows update. This information will help your IT team narrow down the cause significantly faster.

Related articles: How to Integrate Microsoft Teams with Outlook Calendar

For a full index of every Teams guide and troubleshooting fix on Serverman, see the Microsoft Teams complete guide and troubleshooting hub.