Thanks Vla, it seems that Windows (MSN) Messenger has been updated to version 4.6.0073 There is no word on any feature changes for this build and it has not appeared either Windows Update or Microsoft Download Center.
Send instant messages with cool, new emoticons, call anywhere in the world from your computer, see when someone's typing, page a contact's mobile phone, send pictures and music to your friends, and much more.
View: .NET Messenger Service
Download: MSN Messenger for Windows 95, 98, Me, NT and 2000
Download: Windows Messenger for Windows XP