Assume that you use Microsoft Outlook 2016 to connect to Microsoft Exchange Server 2013 or Microsoft Exchange Server 2016 in cache mode. Then, you send an email message that contains a text attachment whose size is exactly 32,732 bytes. In this situation, the recipient receives a corrupted attachment.
This issue occurs because the size of the attachment stream isn't handled correctly by remote operations (ROPs).
To fix this issue, install one of the following cumulative updates:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.