Does Smime works fine with Windows 2000 PKI

Hi everybody,

Just a question :

Is there any known issues using S/MIME with Win2000PKI-certificates ?
More generally, are Win2000 certificates usable with (and understood by ) the 
others mailers (especially Lotus Notes, Netscape, Eudora +plug-in?)

Isn't Baltimore Unicert a "better choice" due to its greater compatibility ?

Any advices are welcome.

Regards,

Laurent Deffranne