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After you migrated to Microsoft 365 Exchange, if the following error message appears when you open Outlook, please follow the steps below to update the Registry key.
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1. Close Outlook.
2. Right-click here, select Save Link As..., and save the file to your desktop.
   
   
   
3. Double-click the SignInOption0.reg on your desktop
   
   
   
4. Click Run.
   
   
   
5. Click Yes to User Account Control prompt.
   
   
6. Click Yes.
   
   
   
7. Click OK.