not allow users to connect to the webmessenger from the page of hotmail.....
Here you've got the tutorial how to block any website with SEP:
Allow and Block websites using Symantec Endpoint Protection Firewall:
http://www.symantec.com/connect/videos/allow-and-block-websites-using-symantec-endpoint-protection-firewall
I do not want to lock the hotmail page, users can check your emails, but do not enter the webmessenger
Well, the solution would be to block the address of the messanger - if it is a web application, it's got its address. If yoi check it, you will be able to block the messanger only.
Windows Live Web Messenger URL is the following: http://webim.live.sg/
it worked! many thanks