FYI...If you review the latest SCCS Service Pack/Hotfix .xls from Nortel, it says that Windows 2003 SP1 is acceptable for a Co-Resident server. If you have the Server Application CD-ROM Version 5.00.00 Revision 5, the platform compliance check still wants to see Windows 2003 SP0, and will fail the install. You will have to re-load the OS minus the service pack. Has anyone seen a later Revision of the Server Application CD for 5.0? The install I am currently working on, using the CD listed above, was ordered from Nortel 24 Nov 2005. There isn't a way that I can see, or at least have access to, on Nortel's web-site, to download later software.