- You cannot soft delete messages that contain voice mail attachments.
- You cannot soft delete messages that have attachments (such as a PDF file) that are sent from a FAX server, a printer, or a scanner.
Note This issue does not occur if the message is sent by a user instead of by an application, or if the message has no attachments.
Workaround 1: Hard delete the message instead of soft deletingTo hard delete email messages in Outlook, select the message, and then press Shift+Delete.
Workaround 2: Use cached mode for OutlookWhen you use the cached mode of Outlook, the message can be soft deleted. For more information, go to the following Microsoft TechNet topic:
Article ID: 2822208 - Last Review: Jan 30, 2014 - Revision: 1