NT and XP client in Network?

I’ve got a meeting tomorrow on this, so I need to know quickly…
Can I network NT 4.0 clients and XP clients in a domain where the server will be running Microsoft SBS 2003?

The CEO has expressed that he may wish to keep an old workstation on with the new network. The new network clients are all going to be XP Pro. But the old client currently runs NT 4.0 and does not have the min requirements needed to run XP which means it’s going to stay NT 4.0.
Thanks!
Tink