UPDATE: A member of the Windows PR team issued this statement regarding the Twitter feeds posted in the Saks Fifth Avenue holiday window display:
Important to note that the windows are the private property of Saks Fifth Avenue. As such, there are filters in place to make sure that in opening them up to Twitter feeds we had content that was appropriate for the general public to view and was within the holiday theme. This filter includes any attempt to spam the windows with negative commentary that is not in the spirit of the holidays. The windows have not been hijacked in any way.
In an effort to promote its new software, Microsoft teamed up with New York's Saks Fifth Avenue store to help build Windows 7-powered holiday windows and to create a PC-themed lounge for shoppers.
Unfortunately for Microsoft, Mac lovers have tried to usurp part of the Saks Fifth Avenue window display and use it to promote Apple, and put-down Windows.
The Saks windows, which were inspired by scenes from the kids' book "Twinkle, Twinkle, Little Flake," also feature a live Twitter feed that displays a stream of real-time Tweets tagged with the hashtag "#holidaywindows." These posts are all displayed, very publicly, on the Windows 7 holiday Windows right off of Manhattan's Fifth Avenue.
The Twitter feed was intended for customers to share their holiday wishes on the Microsoft-sponsored 50th street window.
Mac-loving Twitterers, however, have been using the hashtag to Tweet out how much they adore Apple products, to criticize Microsoft, and to point out Windows' flaws.
See the screenshot below for an example of what's been said about "#holidaywindows", and follow the Twitter feed below for more real-time updates.
And from Gizmodo:
See photos of Microsoft's Windows 7 holiday display at Saks below.