Microsoft has quietly released an upgrade that lets Office Mobile users work with Office 2007 documents.

The accidentally leaked by a Microsoft blogger who pointed to a live download page in late September. At the time, Microsoft said the update was made public accidentally and would be officially available in a couple of weeks.

The current upgrade web page reads almost identical to the one that was accidentally posted and then removed two months ago. One notable exception is that the upgrade, according to the current page, is available to Office Mobile users of Windows Mobile 5.0 for Pocket PC as well as Windows Mobile 6. The page previously said it was available only for Windows Mobile 6 users.

Prior to this upgrade, Windows Mobile users could read Office 2007 documents using third-party software tools, like the one from DataViz.