I recommend that you change your password and set up 2-factor authentication on your account.
How to use two-step verification with your Microsoft account
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Hello, I sent an email yesterday from a computer that I haven't used in a long time. Yesterday evening and this morning I could see the email in my "Sent" folder on my computer as well as on my iPhone and iPad. However, when I tried to access the email today it had disappeared from my "Sent" folder. Also when I tried to look for it on other devices (iPad and iPhone) for a moment I could see it but then it disappeared in front of my eyes all of a sudden. Moreover I cannot see any trace of it in any of the other folders such the "Trash", "Junk", "Archive" etc... This leaves me wondering if it ever got out at all.
I recommend that you change your password and set up 2-factor authentication on your account.
How to use two-step verification with your Microsoft account
-----------------------------------
If this is helpful please accept answer.