Office 365, Email, Exchange, Outlook, How To Delete and Re-Add An Email Account in Outlook

Deleting and Re-adding an email account in outlook, Outlook Data Files, You cannot delete until you create a new data file

Please note that this will completely remove the selected email account from Outlook and delete the cached local copy of your mailbox, but items on the server will not be affected. These steps should only be taken after less drastic steps in troubleshooting an Outlook issue have failed.

Windows:

Mac:

Removing:

https://www.umass.edu/it/support/email/remove-exchange-account-ios-android-apple-mail-calendar-outlook-2011

Adding:

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Office 365, Email, Exchange, Outlook 2016/365 for Mac