I know exactly how you feel.
in reply to Re: Re: ADSI: Getting a full list of users from a w2k domain
in thread ADSI: Getting a full list of users from a w2k domain
Check the settings on you AD Server, as per this and this, and note the caveats and limitations on the latter page regarding max number of entries in a secondary user group, and the MAX size of MaxPageSize.
Short of it: Looks like you can set MaxPageSize in AD as well, but the MAX MaxPageSize / request is 1000...Looks like you're SOL (another microsoft link here that supports the claim).
Flex the Geek