XP pro, killing mail server.

[Front242]

We have a lab that has 7 XP pro machines that kill our Mac 9 mail server whenever they go online (this is a 90% Mac environment). Is any one familiar with this problem. We have run Adaware, Spybot and antivirus tools to try to correct this problem to no avail. This is in a school setting. Any help would be appreciated.

[sixf00t4]

what do you mean by kill?

only when all 7 are on? you can't narrow it down to 1 pc?

[Front242]

It doesn't seem to matter which PC is on or if all are on. By kill I mean crash. We are not affected by the XP home, 98 or 95 computers, just the Pro's.