For better or worse, if you want to develop for Windows Phone 7 and publish, you have to pay Microsoft $99 for the privilege. However, if you publish two games to the Marketplace, you can get that back in a rebate from big'ol MS. That rebate was set to expire...well soon (it was always a temporary offer). Well, both an extension and a firm date has been given: February 15th, 2011.
So if you haven't yet done so, either publish those titles and/or send in the rebate.
Source: Doris Chen's Blog
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Daniel Rubino is the Editor-in-chief of Windows Central. He is also the head reviewer, podcast co-host, and analyst. He has been covering Microsoft since 2007, when this site was called WMExperts (and later Windows Phone Central). His interests include Windows, laptops, next-gen computing, and watches. He has been reviewing laptops since 2015 and is particularly fond of 2-in-1 convertibles, ARM processors, new form factors, and thin-and-light PCs. Before all this tech stuff, he worked on a Ph.D. in linguistics, watched people sleep (for medical purposes!), and ran the projectors at movie theaters because it was fun.