Email disappearing from sent folder

@Hannah said

I have searched for different key words, checked all of my folders, and logged out to sign back in several times

I am sorry, but in most cases like this, if it was indeed a glitch in the mail handler on the Microsoft Mail Server, you will not be able to recover the emails.

You can bring in Microsoft Support and ask them to look at your account on the mail server and see if the messages are in some intermittent state, but don't expect miracles.

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