On March 3, 2011, Microsoft is changing their trademark policy to align closer to Google's, where you will now be able to bid on trademarked terms, but you won't be able to include them in your ad copy. Microsoft Advertising writes:
We are writing to alert you to some pending changes to the trademark policy within the Microsoft Advertising adCenter Intellectual Property Guidelines. Starting March 3, 2011, adCenter will no longer review trademark keyword complaints. However, adCenter will continue to investigate brand owner complaints related to trademark use in ad text.
We want to make it easier for you to manage your search advertising campaigns. By aligning the adCenter trademark policy with the current industry standard, we hope to help simplify your marketing efforts across the various online advertising programs.
Remember, if you would like changes made to your Microsoft adCenter ads, then don't hesitate to contact us here at Tandem to inform us of any changes you'd like to be made to your accounts.