Saw this at Gartner:
On 9 August 2004, Microsoft announced that it will provide support for WSRP, a standard that allows one portal to consume a portlet running on a remote portal, using Web services protocols.
Since the WSRP Technical Committee approved the standard in September 2003, almost all the portal vendors have announced that they will support it, and many have already shipped products with basic WSRP support. Microsoft has, however, been conspicuously absent from much of this process, even though it has always been one of the leaders in designing and defining Web services. Microsoft placed a representative on the Technical Committee, and hinted at WSRP support, but was slow in making a formal announcement.