How to control security on Windows Live Messenger - recommendations

We have approximately 50 workstations, all running Windows Live Messenger.

In the past couple of weeks, we've been hit by trojans that were not detected by our AV software (Trend Micro).

Some of these were file transfers

Is there a way in group policy to control the permissions in the WLM client?  For example, turn off file transfers?

If no, what other recommendations/suggestions do you have on improving the security management of IM?  Is Office Communications Server the way to go?  Can the personalized WLM client be used with OCS, or is that yet another IM client?

Thank you!
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For a 3rd Party solution you can use PolciyPak for windows Messenger Which will allow you to control all the settings for WLM within AD Group Policy.  Info on their product is here.

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