Windows Messenger is the instant messaging client of choice for businesses in managed environments with connectivity to Exchange IM servers and SIP (Session Initiation Protocol) based IM servers, along with connectivity to the MSN Messenger service.

Windows Messenger 5.0 is the latest version of Windows Messenger. Windows Messenger 5.0 adds the following new enhancements that let you:

- Send Ink Instant Messages from a Tablet PC

- Filter out instant messaging spam

- Turn off Windows Messenger notifications during presentations.

Download Windows Messenger 5.0 For Microsoft Windows XP & Windows 2000

Source : Microsoft