Microsoft servers got quite a workout on Friday from potential testers as the company opened public beta testing of Windows 7 to a broad audience– so much so, in fact, that the company decided to delay the beta's opening until it can bring more servers online. "Due to very heavy traffic we’re seeing as a result of interest in the Windows 7 Beta, we are adding some additional infrastructure support to the Microsoft.com properties before we post the public beta," said a posting on The Windows Blog at around 3 p.m. Pacific Time on Friday afternoon. It included a promise...