I am going to assume that you mean the m810LMR motherboard, and does not have an integrated cpu.
XP support is dependent on board revision:
Motherboard version 1.0 = No AGP port
Motherboard version 1.3 = No AGP port
Motherboard version 1.6 = First version with AGP port
Motherboard version 3.0 = Some support 266Mhz but not sure which
Motherboard version 5.0 = First with official support for 266FSB and 4 channel sound codec
Motherboard version 7.0 = First to support XP+ CPUs and "Morgan" Duron CPUs
Motherboard version 7.0a = First to support XP+ CPUs and "Morgan" Duron CPUs higher than 1600+
Motherboard version 7.1 = Current series
I use this board (rev 7.1a) and it works just fine with XP cpus. With the newest BIOS it supports XP2400+ and XP2600+ cpus.
Its a fine, but not spectacular, integrated board.
It is a micro ATX motherboard design so it fits most cases easily and it should use a good ATX PSU, like Antec or Enermax.