KB937826 is in the process of publication and should be available via the following link http://support.microsoft.com/?kbid=937826
You can upgrade the 180-day evaluation version of Microsoft System Center Operations Manager 2007 to the full product version. To do this, you do not have to upgrade individual files.This upgrade operation requires that you use a Microsoft Select CD image that is available as part of the Microsoft volume licensing agreement. The Select CD image includes a Licensing Wizard to update the license.
To upgrade the 180-day evaluation version of Operations Manager 2007 to the full product version, follow these steps:
Note The system_architecture placeholder represents the architecture of the computer that you are using. For example, this placeholder should be i386 on an x86-based computer.