syncing with outlook, teams and calendar

Question

My new outlook does not sync with calendar nor teams

please call or email or send directions please

Answer 1

Hi @Georges Halloul, 

Good day. Thank you for your patience and for taking the time to confirming that New Outlook is not syncing with your calendar and Microsoft Teams. 

This behavior can occur after moving to New Outlook because it uses an updated synchronization engine and handles calendar data differently than the classic experience. In many cases, the underlying cause is related to account configuration, corrupted local cache, or conflicts between multiple calendar sources, which can result in missing appointments, delayed updates, or a complete sync failure. 

Please follow the steps below, as each option is designed to suit this scenario and restore a consistent calendar experience across Outlook and Teams. 

1/ Confirm the account connection and calendar sync settings 

• Open New Outlook and verify that your primary email account shows as connected and signed in successfully.  
• Open the account settings and review the server configuration to ensure it matches your Microsoft 365 or Exchange setup. 
• Check the Send and Receive configuration so your account is included in the automatic sync schedule.  
• Open the Calendar view and confirm the correct calendar is selected, then review the calendar properties to validate permissions and sharing settings if shared calendars are involved.  

2/ Repair or reset New Outlook to rebuild the local sync state 

• Close New Outlook completely to ensure the cache is not active during troubleshooting.  
• Open Windows Settings, go to Apps, then Installed apps, locate Microsoft Outlook, open Advanced options, and select Repair to fix corrupted app files while keeping your data.  
• If the issue continues, return to Advanced options and select Reset, then sign in again and allow time for calendar data to download and rebuild locally.  

• If needed, clear the local Outlook cache by navigating to the Outlook folder under Local App Data while Outlook is closed, then reopen New Outlook and let it rebuild the cache from the server.  

3/ Advanced checks when the issue persists in a work or school environment 

• Before deeper changes, create a backup export of your calendar so your data is protected during advanced troubleshooting. 
• If you have an IT administrator, ask them to review calendar folder structure and statistics in Exchange Online, since folder level issues can block synchronization.  
• If you see server connection messages, verify that your network, firewall, or proxy is not blocking Microsoft 365 connectivity, because this can prevent New Outlook from syncing calendar updates.  
• If duplicates or conflicts appear, review connected data files and remove redundant calendar sources that may be competing with your primary mailbox calendar.  
• If you reply with any error text you see in New Outlook during syncing, I can help map it to the most appropriate option above. 

If the issue continues after these steps, it may help to temporarily switch back to Classic Outlook or contact your organization’s IT administrator to review your account configuration or you can ask your IT administrator to submit a support request directly to Microsoft Support team.        

They can raise a support ticket by visiting: Get support - Microsoft 365 admin | Microsoft Learn  

As community moderators, we appreciate your understanding that our access to internal development details is limited. Our primary role is to guide users toward the appropriate resources and support channels. While we may not have visibility into deeper backend analysis, we’ll continue doing our best to support you within the scope of our responsibilities.      

I hope this information is helpful.  Should you have any further questions or need additional assistance for you and your IT admin, please feel free to reach out.         

Thank you for your patience and your understanding. I look forward to continuing the conversation.  

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Answer 2

Follow these steps to troubleshoot Outlook not syncing with calendar and Teams:

1. Verify the account type
   • If the account in Outlook is set up as IMAP or POP, calendar and contacts will not sync. Only email syncs with IMAP/POP.
   • The account must be added using Exchange / Microsoft 365 / Exchange ActiveSync for calendar and Teams integration to work.
2. Reset the account in Outlook mobile (if using Outlook on phone/tablet)
   • Open the Outlook app.
   • Go to Settings.
   • Tap the account that is not syncing.
   • Tap Reset Account and then check if calendar starts syncing.
3. Remove and re-add the account in Outlook mobile
   • In Settings, tap the account that is not syncing.
   • Tap Delete Account > Delete From This Device.
   • Add the account again using the Microsoft 365/Exchange option (not IMAP/POP).
   • If prompted to configure as IMAP, be aware that this will not sync calendar or contacts; contact the email admin/provider for correct Exchange/ActiveSync settings.
4. Check for general Outlook mobile sync issues
   • If the account was syncing before and stopped, follow the guidance in Fix Outlook.com email sync issues from the referenced article to remove and recreate the sync partnership.
   • Ensure the Outlook app has permission to access Calendar and Contacts in the device’s app permissions.
5. Fix corrupted calendar configuration affecting Teams meetings (desktop/new Outlook)
   • If the issue is that the Teams meeting toggle is missing when creating events in new Outlook or Teams, the mailbox calendar configuration may be corrupted.
   • An admin can run the following PowerShell cmdlet against the mailbox:

          Set-MailboxCalendarConfiguration -Identity <user-upn> -DefaultOnlineMeetingProvider TeamsForBusiness
     

   • After this change, restart Outlook and Teams and test creating a new event to confirm the Teams meeting option appears and calendar sync behaves correctly.
6. If still not working
   • If using a work or school Microsoft 365 account, contact the organization’s Microsoft 365 admin or technical support so they can:
     • Confirm the mailbox is healthy.
     • Confirm Teams and Exchange Online licenses are correctly assigned.
     • Run the PowerShell fix above if needed.
   • For Outlook.com or Outlook app issues outside an organization, contact Microsoft support.

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References:

• Can't sync calendar and contacts with my phone or tablet
• Troubleshoot Outlook mobile issues
• Teams Meeting toggle on new Outlook and Teams upon creating event not available - Microsoft Q&A