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Assume that you use a client to connect to Exchange Server through Internet Message Access Protocol (IMAP). When you try to request for emails in a UID range of a certain pattern, you may find that the emails that are outside the UID range are returned to the client.
This issue occurs in Microsoft Exchange Server 2016 and Exchange Server 2013.
To fix this issue, install one of the following cumulative updates:
Learn about the terminology that Microsoft uses to describe software updates.
Keywords: CI74018, kbcontentauto, Emails outside a UID range are returned, requesting for emails by IMAP, request for a certain UID range of emails returns emails that outside the UID range