Advanced Exchange account settings for Outlook for Mac
https://support.microsoft.com/en-us/office/advanced-exchange-account-settings-for-outlook-for-mac-22af6b87-a090-4476-8e34-6e3c5fd619ad
WEBSettings include options for changing port numbers, using SSL, downloading message headers, and setting server addresses. To access these settings, click Outlook > Preferences > Accounts, select the Exchange account, and then click Advanced. If Outlook cannot automatically detect your Exchange server, you can enter its address here.
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