You upgraded to SBS 4.5 from SBS 4.0 or SBS 4.0a, but the background bitmap on the SBS logon screen still shows SBS 4.0?

To workaround this problem, use Windows NT Explorer to rename \Winnt.sbs\Lanma256.bmp and \Winnt.sbs\Lanmannt.bmp to .old extensions. If \Winnt.sbs\System32\Lanma256.bmp and/or \Winnt.sbs\System32\Lanmannt.bmp exist, rename them to .old extensions also.

Navigate to "Program Files\Microsoft BackOffice" and copy Lanma256.bmp and Lanmannt.bmp to the Winnt.sbs folder.