Microsoft NetMeeting was a VoIP and multi-point videoconferencing client included in many versions of Microsoft Windows (from Windows 95 OSR2 to Windows XP). It used the H.323 protocol for video and audio conferencing, and was interoperable with OpenH323-based clients such as Ekiga, and Internet Locator Service (ILS) as reflector. It also used a slightly modified version of the ITU T.120 Protocol for whiteboarding, application sharing, desktop sharing, remote desktop sharing (RDS) and file transfers. The secondary Whiteboard in NetMeeting 2.1 and later utilized the H.324 protocol.
NetMeeting was originally bundled with later versions of Internet Explorer 3, and the launch version of Internet Explorer 4.0. It incorporated technology acquired by Microsoft from UK software developer Data Connection Ltd and DataBeam Corporation (subsequently acquired by Lotus).
Before video service became common on free IM clients, such as Yahoo! Messenger and MSN Messenger, NetMeeting was a popular way to perform video conferences and chatting over the Internet (with the help of public ILS servers, or "direct-dialing" to an IP address). The defunct TechTV channel even used NetMeeting as a means of getting viewers onto their call-in shows via webcam, although viewers had to call on their telephones, because broadband Internet connections were still rare.
Since the release of the initial MSN Messenger Service (sic) and later Windows XP, Microsoft has deprecated it in favour of Windows Messenger and Microsoft Office Live Meeting. Note that Windows Messenger, MSN Messenger and Windows Live Messenger hook directly into NetMeeting for the application sharing, desktop sharing, and Whiteboard features exposed by each application
Protocol architecture 
- NetMeeting uses H.323 standard for IP/Ethernet LAN multimedia conferencing:
- NetMeeting audio and video codecs use RTP above UDP/IP connections.
- Application Sharing, Whiteboard, Chat, and File Transfer use ITU T.120 Data Conferencing standard above TCP/IP connections.
As of Windows Vista, NetMeeting is no longer included with Microsoft Windows, and Microsoft recommends using newer applications such as Windows Meeting Space, Remote Desktop Connection, Remote Assistance, Windows Live Messenger and Microsoft Office Live Meeting in place of NetMeeting. Windows Meeting Space works only over peer-to-peer IPv6 local networks, not the internet, only has collaboration features and lacks NetMeeting's conferencing features, however Windows Live Messenger allows 1-to-1 audio-video conferencing. Live Meeting is a paid subscription/service-based offering that includes multi-party conferencing features. For internet collaboration and screen sharing, Microsoft had released SharedView for internet collaboration and screen sharing, however this was End-of-Life 31 January 2012.
However, NetMeeting can still be installed and run on the 32-bit version of Windows Vista. A hotfix for 32-bit Windows Vista was published by Microsoft on March 22, 2007. Users can obtain this hotfix by contacting Microsoft Support. The hotfix contains an installer package to install NetMeeting 3.02 on Windows Vista Business, Enterprise or Ultimate editions. Version 3.02 is essentially a port of 3.01 to Windows Vista: however, some features are not available in 3.02 such as remote desktop sharing invitations (incoming) and whiteboard area selection. Microsoft has stated that the Vista compatible version is unsupported and is only meant as a transition tool to help support collaboration sessions when used with Windows XP-based computers. NetMeeting 3.01 can also be installed under Windows Vista by setting the installer's compatibility level to NT4. There is no KB927853 for 64-bit Windows Vista.
The Windows Vista version of NetMeeting does not install and work properly natively on Windows 7. However, Windows XP Mode (a virtual XP computer running within Windows 7) can be used to regain all NetMeeting functionality. Windows Meeting Space has also been removed in Windows 7. Microsoft SharedView requires internet connectivity, it does not work only over a local LAN and is scheduled to be discontinued by end of January 2012. 
- Implementing Collaboration Technologies in Industry, Bjørn Erik Munkvold, 2003; Chapter 7
- Office Live Meeting
- A hotfix is available to install NetMeeting 3.02 on computers that are running Windows Vista
- Microsoft SharedView v1.0
- NetMeeting download website
- Instructions for activating NetMeeting under Windows XP
- Tutorial: Secure Remote Assistance with Netmeeting and Hamachi
- Tutorial: Real Time Online Collaboration
- Easy Meeting Classic is a NetMeeting replacement for Windows 7 and Windows Vista