Here's one more MDM Service Pack 1 issue for you, this one involving a setup error you might run into when upgrading:
Issue: Upgrading to System Center Mobile Device Manager 2008 SP1 fails with the following message:
Failed to determine status of MDM databases on SQL instance '<instance_name>'. Setup will now roll back all changes
Cause: During the upgrade, System Center Mobile Device Manager 2008 SP1 does not have access to the DB_USER and DB_PWD properties provided in previous installations of Device Management Servers or Enrollment Servers. It will instead default to using the current windows user's credentials.
Resolution: There are two ways to work around this issue:
1. Use Windows integrated authentication instead of the SQL username and password. The user who performs the upgrade must have sufficient privileges on the SQL Server where the MDM databases reside.
2. Uninstall your existing version of MDM prior to installing the SP1 version. Do not remove the existing databases during the uninstall process or your data will be lost. Once MDM is uninstalled, install System Center Mobile Device Manager 2008 SP1. It will give you the option to use the databases from your previous installation of MDM.
J.C. Hornbeck | Manageability Knowledge Engineer