I am unable to access my Sent items in the Sent Folder in Outlook 2007. I receive the following error: "The messaging interface has returned an unknown error. If the problem persists, restart Outlook." Of course, restarting does nothing to solve the problem. Can anyone help?

It works OK in OWA i imagine? If so i'd reccomend posting in an outlook forum as this is more for Exchange administration. Also, try running MS office diagnostics from from the office tools folder.

Are you using Outlook in cached mode? Then you might need to delete or resetthe OST file http://technet.microsoft.com/en-us/library/61049636-1af3-4b54-a3d0-7e2805aadf4b.aspx Deli

What is OWA? I ended up having to delete and then re-create my profile and this fixed it. It seemed extreme, but it worked.

With Office Outlook Web Access, you can use a Web browser to access your Microsoft Exchange Server mailbox from any computer with an Internet connection. You can use Outlook Web Access with Microsoft Internet Explorer or many other browsers for UNIX, Apple Macintosh, or computers running Microsoft Windows. Outlook Web Access is an effective solution for people who require roaming, remote access, or cross-platform functionality.