Following up on my post above, I looked for a definition of gay friendly on Human Right's Campaign's website and found the
2004 Corporate Equality Index (pdf file) which ranks large companies according to 7 criteria:
By these standards -- which I think are remarkably extensive -- it seems to me that Microsoft's Brave Sir Robin act would not change their status as a gay friendly corporation. I thought criterion 7 might possibly cover something like withdrawing support for a gay rights bill, but according to the footnote, companies only lose points under that criterion if they actively undermine GLBT employment practices or direct corporate contributions to anti-gay organizations.
Microsoft scored an 86% last year, btw, the industry average for computer companies. They lost points because they neglected to add gender identity and/or expression categories to their non-discrimination policy.