Microsoft has worked with standards bodies for CIFS, Kerberos and LDAP, the whole pile of web standards (and their .docx thing, but this one is a joke). It doesn't mean you can interoperate with them, because they have introduced involved bugs and matching workarounds, then enshrined them for decades by never breaking compatibility. SPDY can avoid this because it already has diverse implementations in the wild, but if Microsoft acquires credibility for mobile extensions to SPDY, they'll push a half-broken implementation to carriers and gain a competitive advantage on smartphones.