They've done the same for Weatherbug, which is why I prefer to recommend CounterSpy rather then MS's Antispyware.
From a prior post of mine:
How many ‘vendors’ can ‘convince’ Microsoft to allow their adware/spyware? Some interesting articles can be found at the following websites (a paragraph or two from each one immediately follows the link):
“While certain adware companies have been looking to bribe anti-spyware companies into taking them off the list, Broadband Reports wondered how Microsoft would respond to such an approach. Already, the company faced just such a question, as the anti-spyware software identifies Weatherbug as a possible threat. Weatherbug, of course, used to be a big adware provider, but claims that they've reformed from their earlier ways and no longer do such things. As such, they were peeved about the classification -- even if it's described as a small threat. Microsoft quickly backed down and agreed to remove Weatherbug from the list.
“A Microsoft spokeswoman said the beta product included a vendor dispute-resolution mechanism to deal with complaints from third-party companies.
In the case of WeatherBug, the dispute-resolution process paid immediate dividends. On Friday, the company received a response from Microsoft with the good news that the current signatures for Minibug will be removed.