Last week WSE 2.0 Service Pack 1 released to web, coinciding with BizTalk Server 2006’s generally availability in the field. This adapter enables interoperability between BizTalk Server and other applications that require use of WS-Security, WS-SecurityPolicy, WS-SecureConversation, WS-Trust, WS-Policy protocols as implemented in WSE 2.0 protocol stack. This service pack, in particular, allows the WSE 2.0 adapter to work with BizTalk Server 2004 as well as BizTalk Server 2006.
More information on this release can be found on Microsoft.com:
http://www.microsoft.com/biztalk/evaluation/adapter/adapters/wse/default.mspx