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My Outlook 365 won't open after a Windows update yesterday Microsoft Q&A | #repair PST file without data loss

My Outlook 365 won't open after a Windows update yesterday Microsoft Q&A

My Outlook 365 won't open after a Windows update yesterday Microsoft Q&A

If you manually type in the secondary connected account email address in the "From" field, the email is sent as "On behalf of" your primary Outlook.com account.