It depends what you mean by "Primavera". That's a generic name, there are
many products. But most times, it's Prmavera Project Planner ("P3") that is
being referred to, because that program has been around since the start of
Primavera Systems, Inc.
P3 can import/export to MPX format only, but Primavera (and other vendors)
also has a MPX/MPP utility. The new programs (in the Primavera Enterprise,
P3e/c for Constructioin, and Primavera TeamPlay suites) can import/export to
both MPX and MPP formats. And it is a "sophisticated" feature, in that you
can specify how to handle different fields. Also, the "added value" in the
Primavera programs will no be lost if new MS-P data is brought in.
As Rob suggested, there are also Primavera News Groups, if you want to
register for any of these go to
www.primavera.com/support/forums.html.