Yes, no, and maybe.
On one hand, I agree that yes, bits of Microsoft are reaching out to open standards, interoperability, etc... but only because in those areas, they don't have a frickin' choice.
Microsoft is being all friendly with open web standards now, because they've seen Internet Explorer's market share drop like a rock (in spite of dominance), with little indication of slowing down the free-fall. They've been watching more and more users install Firefox, Chrome, (and yes, even) Opera, etc. Even Safari has a substantial bit now. They're watching an increasing mobile market that has no use for IE-specific rigging at all. Now contrast all this with 2002, where IE was pretty much the only browser left standing, with something like 96-98% of the market. Now they're down to just under 60%, and again, still dropping.
Now contrast this with their antics in the Office realm, where they still own the market. The whole ODF drama (among similar) is a solid indication of Microsoft at its best shade of evil. They can afford to be evil here because... well, what exactly are you going to do about it? Sell your privacy and soul to Google Docs? Try and scrape by on OpenOffice? Puh-leeze. They know you're stuck with MS Office, and so do you. To that end, they've been leveraging the unholy crap out of it - expanding Exchange, latching on dependencies with SharePoint and OCS... and you'll find damned little reaching-out to the open source / open standards realm (unless they absolutely have to, as the presence of the half-compliant ODF plugin for MS Office has evidenced).
Long story short - unless it is obviously threatening their dominance in a given area, or they never had dominance, they'll stick to type.
Sun-Oracle, oh yes I can agree with you on. If there is one person capable on this Earth of being a greater C*nt than Steve Ballmer, it's Larry Ellison. 'nuff said about that, methinks.
On the Linux side, though - there's far too many companies (in a general sense) betting their futures on the thing - IBM, RedHat, even Cisco nowadays (guess what IOS is getting replaced with if the new Nexus and Mars product lines are any indication?) And that's just a top-of the head list...