BizTalk Server 2010 supports upgrade from BizTalk Server 2006 R2 or BizTalk Server 2009. As part of the upgrade experience, all the application data and artifacts are preserved so that after the upgrade, the BizTalk Server applications continue to run without any problems. In BizTalk Server 2010, the model for trading partner management (TPM) has gone through some fundamental changes. So, to migrate the party-specific data from BizTalk Server 2006 R2 or BizTalk Server 2009 to the new TPM model in BizTalk Server 2010, you must run the Microsoft BizTalk Server Party Migration Tool (Party Migration Tool).
Microsoft recommends that you first understand the remodeled Trading Partner Management solution in BizTalk Server 2010 before you start migrating the existing party definitions using the Party Migration Tool. For more information see, Building Blocks of a Trading Partner Management Solution (http://go.microsoft.com/fwlink/?LinkID=189331).