A Rollup Update has been released for Outlook 2016. This is a non-security update which contains the following documented fix.
- This update fixes an issue that causes file attachments to become corrupted in the Office 365 Message Encryption (OME) encrypted messages.
Note: This update can be installed via Microsoft Update and updates Outlook to version 16.0.5134.1000. This update does not apply to Perpetual (Retail) and Microsoft 365 based installations of Office 2016.