Has anyone else seen this behavior? A client has a two server Exchange 2007 topo; 1 server for MBX/UM and 1 for CAS/HUB. The great majority of mailboxes on the mailbox server were migrated from Notes to 2003 to 2007. They all work perfectly. The problem is this: When creating a user within ADUC, then provisioning a new mailbox within the Exchange 2007 EMC (and associating the previously created user account), the user cannot log into their mailbox through Outlook or Outlook Web Access). If we create a new mailbox within the Exchange 2007 EMCand createa new user at the same time, then all is well. Idea's?

This was solved by repeating the SP1 installation on the MBX server.