Attachments Not Showing on Digitally-signed Messages in Outlook Web App (OWA)
When a message is digitally signed and contains an attachment, the attachment is hidden from view for both the sender and receiver in Outlook Web App (OWA). The attachment does get sent, but is just obscured from view in OWA.
The Office 365 Team has a support ticket with Microsoft and we will provide more information when Microsoft provides a fix.
Unfortunately, there is no fix for OWA on this issue. If you need to digitally sign messages with attachments, please work in a desktop client such as Outlook. If you must use Outlook Web App, please remove the digital signature from the message.
Last updated June 28, 2013 @ 10:36 am