Email attachment restrictions in Office 365
To prevent the spread of malicious software UWM's implementation of Office 365 blocks emails that have files with executable content as attachments. Examples of file types that would be blocked are .exe, .scr and .pif files. This block also filters zip files that contain files with executable contents. All such emails will be dropped with no notification to either party.
Zip files that do not include such files will be delivered normally.
Users who need to share such files should use Pantherfile or OneDrive. Information on using OneDrive may be found at http://uwm.edu/o365/onedrive/