Further to my blog over the weekend on building your own Home Server, the Windows Home Server team have now released the recommended hardware specs for running Beta 2.
CPU: 1GHz Pentium 3 or better
RAM: 512MB minimum
Hard Drive:1 Hard Drive 80GB internal (IDE, ATA, SATA, or SCSI)
DVD drive that is bootable
Monitor for the installation
QWERTY Keyboard and mouse or a compatible pointing device. Also installation only.
Network Interface Card (NIC) 100Mbps Ethernet
They do make the point however that multiple hard drives are preferred, for use with file duplication settings - this mirrors your files across multiple drives to ensure a backup is safe in the event of a drive failure.

October 31st, 2007 at 4:27 pm
Will Home Server install on “lower” hardware? I have a Dual 600Mhz PIII server that is currently running W2K3 but I like all the functionality that Home server includes so I wanted to try it out before I go and buy new harware.
February 14th, 2008 at 4:13 am
I was able to get it running on a PIII 800 Mhz system.
February 15th, 2008 at 6:12 am
I got it running on a Celeron 2ghz seems to be ok
February 17th, 2008 at 7:59 pm
Mike, i was able too, only if not so much of users