We knew that Bing was the default search engine for Windows Phone 7 handsets, but earlier information about the mobile OS suggested that carriers and OEM’s could change the search engine as part of the allowed customizations. Apparently that information, which was based upon leaked documents, is now incorrect. In a recent interview with Pocket-Lint, Greg Sullivan, senior product manager for Microsoft, confirmed that Bing is the one and the only search engine for Windows Phone 7 handsets. Sullivan stated that “the search engine has been heavily integrated into the OS, so it would be hard to offer an alternative.” While the default search engine for the device can not be changed, OEMs, carriers, and individuals can presumably add a second search engine via a downloadable application or possibly within the Hub interface. Anyone turned off by this restriction or is it a non-issue?