Is enabling Messenger Service still a security risk?

I want to simply communicate to users that we are loggin into their machines to perform work and i was not sure if by enabling Messenger Service will cause security risks. I remember in XP SP3 MS disabled because sinister marketers were utilizing it to send msgs.

Currently i am asking about XP systems and SBS 2003 boxes, but also need solutions for new HW such as SBS 2k8, Win 7.
Any thoughts?

*Looking for opinions from experts in security.*
LVL 32
Blue Street TechLast KnightAsked:
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cdesignerCommented:
Usually not, because there was the spam issues only. But block the ports: 137,138,139 in your firewall between LAN and internet.
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Blue Street TechLast KnightAuthor Commented:
Ok. Thanks. Are you referring to the software f/w in Windows or the gateway f/w?
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cdesignerCommented:
gateway firewall. if you'll block these ports at client computers - "net send" will not work. Also there is a possibility that your internet provider already blocked it.
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Blue Street TechLast KnightAuthor Commented:
Thanks! Is there a way i can test that or do i just have to call them?
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cdesignerCommented:
Call is the best way. Tech support should know - do they block netbios ports or not.
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Blue Street TechLast KnightAuthor Commented:
Thnaks!
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