When you use OlSaveAsType enumeration in Microsoft Office Outlook to save a message that is hosted in a Microsoft Exchange Server 2010 mailbox, you find that the message subject or message body is not set as expected.
The OlSaveAsType enumeration operation uses MAPI on Middle Tier (MoMT). However, MoMT does not process the properties correctly when multiple properties are changed.
To resolve this problem, install the following update rollup:
976573 Description of Update Rollup 1 for Exchange Server 2010