BigAnt Messenger is an easy to use messenger with a neat look and familiar interface, there is no leaning curve to use this BigAnt messenger, all your client computers will be connected to IM server that located in your company, regardless you have LAN connection only, or you are connected from internet or via VPN, and even more, your login account and password can be the same as they are in Active Directory/LDAP.
Unstable and consumes a lot of system resources, very sad :(
There is an amazing point that BigAnt can send files by folder! You can never worry about your recipient will miss or mix up when there are too many files on the way. Just put all your files in one folder and send it