One of the big things that happened at this year's DrupalCon was an unexpected vendor showing off something they'd been working on for a while - Microsoft was promoting the latest release of their SQL Server Driver for PHP (and how it could be useful for Drupalers). Brian Swan talks about the event in his latest post.
One question, asked by nearly everyone I talked to, was the source for my learning: What is Microsoft doing at DrupalCon? I have to admit that I wasn’t as prepared for this question as I should have been. For me, it was (and had been for a few weeks) obvious: we were at DrupalCon to announce the release of our latest SQL Server Driver for PHP [...] But that’s not what most people were asking. That announcement itself was only of moderate interest. People wanted to know what Microsoft was doing at DrupalCon. How did we come to wander into this neighborhood?
He points out that Microsoft was more of a stranger in the Drupal community that other companies and that they were usually considered irrelevant to the project. The company wasn't shunned by the community, they just confused most people in their presence. The SQL Server driver release helped it make a bit more sense to people, but Microsoft still has a ways to go in some of their Open Source efforts to really be accepted by communities on a wider scale.