HT204173: Use Mail Connection Doctor
Learn about Use Mail Connection Doctor
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Helpful answers
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Mar 31, 2016 12:11 PM in response to Jojobvby Linc Davis,Please back up all data.
Open the Internet Accounts pane in System Preferences and make a note of the settings for the Exchange account. There may be separate entries for mail and other services, such as contacts. Then delete the entries. Confirm that you want to delete the data. It will still be on the server.
Recreate the account with the same settings. Test.
