The minimum specifications of a computer to be able to run the next Microsoft Office version has been revealed. Here they are:

Processor: Intel Pentium 500 MHz
RAM: 256 MB PC100 SDRAM
Operating System: Windows XP Professional with Service Pack 3
Video Card: 64 MB RAM with DirectX 9.0c

The video memory requirement is for Excel and PowerPoint. Those who have machines with multicore processors will run the Office 2010 faster.

Source: Theinquirer.net