A Microsoft employee on Thursday accidentally blogged about an upgrade to Office Mobile that shouldn’t be available for another couple of weeks. The upgrade, when it becomes available, should solve an incompatibility issue that left Windows Mobile 6.0 users unable to read Office 2007 file formats.

Jason Langridge, who works in Microsoft’s Windows Mobile group in the U.K., wrote that Office Mobile 6.1 was available and he included a link to the download page. But a representative with Microsoft’s external public relations firm said that the upgrade was put up on the site initially for internal testing and was accidentally made available to the public.

The new version of Office Mobile is expected to become available very soon, probably within the next two weeks, he said.