<p>An undetermined number of mobile users of Microsoft's Hotmail and Outlook.com have been unable to access the service for the past several days.</p><p>The problem is affecting iPhone, iPad and Android phone users, according to posts on the Microsoft Answers forum. It also, according to some, is affecting some Windows Phone and Surface RT users, as well.</p><p>The problem seems to stem from issues with Exchange ActiveSync, the Microsoft protocol for accessing Exchange Server natively from mobile devices.</p><p>On January 10, I asked Microsoft for an update on the issue, which still seems only partially resolved. A spokesperson emailed me the following statement:</p><p><a href="http://www.zdnet.com/mobile-hotmail-and-outlook-com-users-hit-by-multi-day-access-issue-7000009676/">Keep reading...</a></p>