Are there any programs which interact with Windows so that you can instant message people based upon their windows log in name within a network? In other words, we all log into the work domain under the scheme firstname.lastname, and can log in on any workstation in the office. Is there any way to establish a program so that we can instant message eachother using those login names? I understand an instant messaging service would take a server, etc. Assume we can do all this, I just want to know if such a thing exists. Thanks for your help.