CWmike writes: Microsoft's first Windows Phone 7 update is apparently causing some users' phones to not work. Microsoft has advised at least one person to take his device into a store for a fix. The company's WindowsPhoneSupport Twitter account shows the responses to a variety of queries from users who have experienced problems over the last half-day. Microsoft released the update on Monday but played it down. The update was designed only 'to improve the software update process itself,' wrote Michael Stroh on the Windows Team Blog. One user, Alex Roebuck, wrote on Twitter that the update had bricked his Samsung Omnia 7. 'We're very sorry for the inconvenience,' Microsoft responded on Twitter. 'For this issue we would suggest taking it to a store.'