Hi, What's your account type in your Outlook, IMAP, POP or Exchange account? If you are using an Exchange account in Outlook, please click Tools Accounts. Under the Server Information, change the User Name to your email address instead of Domain/UserName format to have a try. If you are using internet account, please remove then re-add the account in Outlook to confirm if the issue persists. Also change your password on the Webmail to have a try. If the issue persists, please create a new profile for the problematic account on Outlook for Mac: Regards, Winnie Liang TechNet Community Support Please mark the reply as an answer if you find it is helpful.
Many outlook users try to password protect email messages in outlook from prying eyes on mac, but most of them seem to be caught up in a misunderstanding if you haven’t installed MacFort, click the button to download MacFort: Please try the following steps to password protect emails in outlook. Outlook 2011 for Mac data can be backed up in a number of different manual and automated methods. This techinique has the advantage of storing your Outlook 2011 for Mac data into a single file for safe keeping or transfer to another Mac. Your Outlook for Mac data will be saved into the file.
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