In recent builds of Microsoft Outlook, Microsoft has added a MOST RECENT SIGN IN feature and that is very helpful if you think someone else may have been checking your email.
To see the last time someone logged into your email, just click FILE and look at the INFO section for MOST RECENT SIGN-IN
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There is also a very helpful SEE ALL RECENT SIGN IN ACTIVITY which takes you to a page showing all of the logins to your Microsoft account:
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