If you need to buy a new copy of Microsoft Office but don’t want an instantly outdated suite when Office 2010 is released later this year, you’re in luck: If you buy Office 2007 any time between March 5 and September 30 of this year, you automatically qualify for a free upgrade to Office 2010 when it’s released.

More information here.

Indications are that Office 2010 will be broadly available in June.  It adds Office Web Internet-based applications that work in a browser and for the first time will have both 32-bit and 64-bit versions.