RESET OFFICE 365 MAIL SYNC-TO BE DONE BY THE USER
In incase you need to reset your Office 365 for any reason, follow these steps
Log out of the Microsoft 365 Account and clear their browser's cache
Click on Disconnect Mail Sync (on their user's settings)
Click User Menu > Settings in SharpSpring's top toolbar.
Click Mail Sync, located under My Account in the left panel.
Click Sign in with Microsoft.
Enter your Microsoft Office365 email address in the Email, phone, or Skype field.
Enter your Microsoft Office365 email password in the Password field.
Click Sign in.
Click either Yes or No to determine how Microsoft will keep you logged in to your Microsoft Office365 account.
Why was my email sync disconnected?
Most likely, it is due to a password change on your side. If so, please try to log in again using the above methods.