


Note: If Quick Repair does not fix this issue, you can try running the Online Repair as outlined above.the Office 365 add-in requirements, learn more about using the Office 365 add-in. After the repair is finished, please restart the PC try the sync again. Outlook version, Latest stable version of Outlook 2013, 2016, or 2019.Select Online Repair and Continue then follow the prompts.(Selection also say Microsoft Office 365). WARNING: An Online Repair does an uninstall then a reinstall of Office, if something goes wrong in this process, you may need to reinstall Office manually which may require a product key Click Install and follow any prompts provided by the repair tool.Scenario 2: You migrate your mailbox to Microsoft 365 from an Exchange server that Outlook connects to by using RPC. Select the Reinstall or Repair button, click Next. Microsoft Outlook connects to your primary mailbox in an on-premises Exchange server by using RPC, and it also connects to another mailbox thats located in Microsoft 365.Open Control Panel (Start>Settings>Control Panel).Click Continue, and then Start Diagnostics.On the Help menu, click Office Diagnostics.After the repair is finished, please try the sync again.Select Repair, Quick Repair and Continue then follow the prompts.Click Change (may be listed as Modify).(Selection also say Microsoft Office 365 or Microsoft 365). Open up the Control Panel on your PC (and show All Control Panel items, if necessary) and click on Programs, then Programs and Features.
