'%3e%3cpath%20d='M8%200C12.4183%200%2016%203.58172%2016%208C16%2012.4183%2012.4183%2016%208%2016C3.58172%2016%200%2012.4183%200%208C0%203.58172%203.58172%200%208%200ZM11.6162%204.38379C11.2257%203.99337%2010.5927%203.99338%2010.2021%204.38379L8%206.58594L5.79785%204.38379C5.40732%203.99334%204.77429%203.99329%204.38379%204.38379C3.99331%204.77429%203.99335%205.40733%204.38379%205.79785L6.58594%208L4.38379%2010.2021C3.99348%2010.5927%203.99341%2011.2257%204.38379%2011.6162C4.77426%2012.0066%205.40734%2012.0065%205.79785%2011.6162L8%209.41406L10.2021%2011.6162C10.5927%2012.0066%2011.2257%2012.0067%2011.6162%2011.6162C12.0067%2011.2257%2012.0066%2010.5927%2011.6162%2010.2021L9.41406%208L11.6162%205.79785C12.0066%205.40735%2012.0066%204.77429%2011.6162%204.38379Z'%20fill='%23080E17'%20fill-opacity='0.46'/%3e%3c/g%3e%3cdefs%3e%3cclipPath%20id='clip0_3761_713'%3e%3crect%20width='16'%20height='16'%20fill='white'/%3e%3c/clipPath%3e%3c/defs%3e%3c/svg%3e)
How to Fix Outlook for Mac Not Syncing After Exchange Online Migration
Question details
Users are unable to sync emails in Outlook for Mac after their organization migrates to Exchange Online.
- Product
- Microsoft Outlook for Mac
- Device & OS
- macOS
- Scenario
- An organization has recently migrated its email system from an on-premises Exchange server to Exchange Online.
- Observed behavior
- Outlook for Mac fails to connect or synchronize folders, potentially showing account errors, refusing to update specific folders, or operating with a damaged profile.
Verify your internet connection and log in to Outlook on the web (OWA) to confirm your account is fully active and functioning on the new Exchange Online server.
Remove and Reconfigure the Exchange Account
Removing and re-adding the account forces Outlook to pull the correct new autodiscover settings directly from Exchange Online.
When migrating servers, local configuration settings may become outdated. Reconfiguring the account ensures that Outlook for Mac builds a fresh connection to the new Exchange Online environment.
Launch Outlook for Mac, click on 'Tools' in the top Apple menu bar, and select 'Accounts'.
Select your existing Exchange account from the left pane. If there is a yellow or red error indicator, click the minus (-) icon at the bottom to remove the account.
Click the plus (+) icon, select 'New Account', and enter your email address. Follow the prompts to authenticate and let Outlook automatically configure your Exchange Online connection.
Empty the Cache for Specific Folders
Use this method if the overall app connects fine, but only specific folders fail to sync new emails.
Rebuild the Outlook Database Identity (For Older Versions)
If you are using older versions of Outlook for Mac (such as Office 2011), the primary database identity itself might be damaged.
Looking for a Lighter Alternative to Microsoft Office?
If Microsoft Office applications frequently encounter sync issues, profile corruption, or require heavy updates, try WPS Office. It provides a lightweight, highly compatible alternative for your document, spreadsheet, and presentation needs on macOS.
- 1. Download the App: Visit the official WPS Office website to download the native macOS installation package.
- 2. Install WPS Office: Open the downloaded file and drag the WPS Office icon to your Applications folder.
- 3. Open Your Files: Launch WPS Office and seamlessly open your existing DOCX, XLSX, and PPTX files.
Frequently Asked Questions
Why does Outlook for Mac stop syncing after an Exchange migration?
This usually happens because the application is still trying to use outdated autodiscover settings pointing to your old on-premises server, or because local cache data has become corrupted during the transition.
How do I know if the syncing issue is with my Mac or the Exchange server?
Try logging into Outlook on the web. If you can see all your recent emails and send messages from the web interface, the server is fine, and the issue is localized to the Outlook application on your Mac.
Will emptying the folder cache delete my saved emails permanently?
No. Emptying the cache only removes the local downloaded copies on your Mac. Outlook will automatically connect to Exchange Online and re-download all items safely stored on the server.
What should I do if none of the troubleshooting steps work?
Ensure you have installed the latest Office updates via Help > Check for Updates. If the issue persists, contact your organization's Microsoft 365 administrator to verify your account licenses and DNS configuration.
