When we were running Exchange 2003, we used Windows Messenger (WM) for inter-office IM. We recently upgraded to Exchange 2007 but since it doesn't support WM, we kept our old Exch2003 server on-line for WM purposes only. We intend to replace WM with something else, but for now, WM is what we're using. Ever since the Exch2007 migration, we cannot add new users to the WM list of IM members. So we tried to uninstall Exch2003 from the old server and reinstall it with the WM components only. Now IM doesn't work at all! It won't allow anyone to sign in. Any ideas? We some answers ASAP! Thanks!!