Crosby Grant reported on the news for Search Engine Land. You can also find Microsoft’s own blog post by Tina Kelleher on its adCenter Blog, explaining the change. The timing could hardly be more perfect. Some marketers might have wished for more time to prepare to before the rush of shoppers searching for Black Friday and Cyber Monday deals, but it shouldn’t take them long to get the hang of the new feature. After all, users of Google’s AdWords search advertising service have been able to make negative exact matches for quite some time. If you use adCenter’s web interface, you can already tak…