Unfortunately no one can be told what Phantom Linux OS is - you have to see it for yourself.
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Therefore, try disabling hardware acceleration at least temporarily to see if that helps get rid of the Outlook stuck in the loading profile problem.
Microsoft recommends that you use roles with the fewest permissions.
Restart the Outlook application and check if the issue persists.
If you're not sure what plan you have, follow the steps in What Office 365 for business subscription do I have?
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