Quite a few comments on my Revit as a Database post from last week focused on the fact that Microsoft's various versions of 64bit Windows do not include or support a driver for connecting to an Access database via ODBC. The good news is, Microsoft appears to be changing course on this in the upcoming release of Office 2010. Their download site includes both 32 and 64 bit beta versions of their data connectivity component driver. I tested this out in Vista x64 with Revit 2010 x64 and the Office 2010 x64 beta and it works. The bad news: you will have to wait for Office 2010 to ship and many of you do not have a say in when your office upgrades.