"If you weren't aware, Microsoft recently released a Facebook application for Windows Mobile. We've heard some users have been having problems with installation and a new copy of the app has been posted. This version should help anyone that was getting the "cannot install due to insufficient privileges" error and it should also help with some hanging errors."
If you were at wit's end last week getting Microsoft's Facebook application to play nice, you may want to head over to the Windows Mobile web site and try downloading and installing it again. The updated version is signed, and packs a few bug fixes.
Microsoft Updates Facebook Application
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