"Much of the reaction from FOSS folks to news that Microsoft is
joining the Open Source Census centers on concern that Microsoft is
out to find open source users and what open source software they're
using. I think that may be exactly right.
"However, I don't think Microsoft has embarked on a SCO-style
hunt for open source users it can cajole, threaten or sue for
unnamed patent infringements. No, I think Microsoft has genuine
interest in finding out how many open source software users are
candidates for open source on Windows..."