Are there any firewall or information security concerns that need to be address for deploying Jabber?  Customer is looking to deploy Jabber but is concerned about the affects it may have on security/firewall by creating any vulnerabilities? 

I have a user who is getting "Unable to initialize support for cisco emergency responder"  He is on Windows 7, I have read posts about making changes to the windows registry.  The user works remote and doesn't have admin rights, also a little concern...