What program to use for corporate instant messenging?

We currently have a windows 2003 network with xp clients and an exchange 2003 server.  We currently use MSN messenger for instant messenging but our end users have started to spread viruses through it by talking to outside users while on our network.  I was wondering if there is a corporate instant messenging solution that is internally based?  I have heard exchange has something but am not sure.  ANy help would be greatly appreciated.
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MS Messenger does translate into IMing in an exclusively corporate environment, we use the MS product in conjunction with Exchange



I do not have any technical support responsibilities for this product, I am merely just a user of this product.


dbrosnanAuthor Commented:
Unfortunately, "IM is not supported on Exchange Server 2003." so I cannot use MS Messenger.  http://www.petri.co.il/configure_instant_messaging_in_e2k.htm is there any way around this?
Jabber is a freeware based solution that has seen lots of use:


This is a freeware based solution that anytone can use.

For a Microsoft solution, they have rolled it into Live Communication server.  It is no longer part of Exchange, and requires a seperate server to run.


Most large corporations have begun to use this.  It hooks into the popular services MSN, AIM, and Yahoo.  It then allows the corporate security policies to take affect like block file sharing and downloading via the client.  This is the best solution for a microsoft networked environment.  It usually costs about $2 per user per month.


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