Hopefully the two parties can sort things out, but honestly, we'd suggest the Windows Phone team put the whole " add proper Gmail and Google Suiteintegration to WP8" thing above this little squabble.
The ultimate goal for IBM is not only to show that this suite of applications can be more valuable through integration of news feeds created from activity streams, but to also to act as a conduit so that the rest of the applications and sources of information used in a business can have their value amplified by social networking mechanisms.
The same sort of challenges of integration, identity management, disaster recovery that were addressed as ERP and the rest of the enterprise application suite emerged will now have to be addressed in the world of SaaS. The scope of this work is vastly underestimated, as is the maturity of the available solutions targeted at addressing these problems.