Sorry - I wasn't specific in my posting: Mac OS X Server v10.4 10 Client. Lyn On Apr 5, 2007, at 10:19 AM, LuKreme wrote: > On 4-Apr-2007, at 16:08, Lyn wrote: >> It's the Mac OS X 10.4 Client serial number that isn't working >> when entering it via Server Assistant. > > 10.4 Client has a serial number?