WGPOCPL.CPL and XP

I'm still running Microsoft Mail because I like the Netfolder Calendar
sharing that Outlook 2000 offers, in spite of its limitations. I've
still got a couple of machines that run Win2k, but I'm slowly replacing
them with XP machines. I copied the WGPOCPL.CPL and WGPOADMN.DLL files
from one of the Win2k machine and installed them in the Windows\System32
folder of an XP machine, but when I go to run the MS Mail applet on the
XP machine, it accepts the Post Office username and password and then exits.

I see there is an old post here from 2001 with this behavior, but no
response.

Any ideas as to why it doesn't work?

Thanks,

June