Microsoft (NSDQ: MSFT) plans to close the adCenter AnalyticsBeta program, the company said in a post on the adCenter blog. Microsoft said it will still offer technical support to existing testers through Dec. 31, but it will not accept new participants. It didn’t offer a reason why it was winding down the program, saying only that it hoped to understand the needs of small and mid-size self-service customers as well as better develop its analytics strategy. Microsoft, like *Yahoo* and *AOL*, has bet heavily on the growth of display advertising the past few years and with the economic downturn, its been struggling. Perhaps a sign that it felt it couldn’t effectively compete: the blog post, written by adCenter exec Mel Carlson, directs users to two dozen other analytics providers, including *Google* Analytics, Omniture, *Yahoo* Web Analytics and WebTrends.