This is an alphabetic list of defunct instant messaging platforms, showing the name, when it was discontinued and the type of client.
- AOL Instant Messenger, 1997–2017
- aMSN, 2002–2012
- BBM, 2005–2019
- ChatON, 2011–2015
- Emesene, 2013 – MSNP (Microsoft Notification Protocol or Mobile Status Notification Protocol)
- Empathy
- Fetion
- FireChat, 2014–2018
- Gizmo5, 2005–2011 – Multi protocol
- Google Allo, 2016–2019
- Google Hangouts, 2013–2022
- Hike Messenger, 2012–2021
- iChat, 2002–2012
- Instantbird, 2007–2013
- Meebo, 2005–2012
- Microsoft Kaizala, 2017–2023
- Microsoft Messenger service, 1999–2014
- Microsoft Office Communicator/Microsoft Lync
- MSN Messenger, 1999–2005
- Mxit, 2005–2016
- MySpaceIM, 2006–2009
- Odigo Messenger, 2002–2004
- ooVoo, 2007–2017
- PowWow, 1994–2001
- Skype Qik, 2014–2016
- Surespot, – 2022
- Talk City, 2002
- Upptalk, 2010–2017
- Windows Live Messenger, 2005–2012
- Windows Messenger, 2001–2008
- Xfire, 2003–2015
- Yahoo! Messenger, 1998–2018
This is an alphabetic list of defunct instant messaging platforms, showing the name, when it was discontinued and the type of client.
- AOL Instant Messenger, 1997–2017
- aMSN, 2002–2012
- BBM, 2005–2019
- ChatON, 2011–2015
- Emesene, 2013 – MSNP (Microsoft Notification Protocol or Mobile Status Notification Protocol)
- Empathy
- Fetion
- FireChat, 2014–2018
- Gizmo5, 2005–2011 – Multi protocol
- Google Allo, 2016–2019
- Google Hangouts, 2013–2022
- Hike Messenger, 2012–2021
- iChat, 2002–2012
- Instantbird, 2007–2013
- Meebo, 2005–2012
- Microsoft Kaizala, 2017–2023
- Microsoft Messenger service, 1999–2014
- Microsoft Office Communicator/Microsoft Lync
- MSN Messenger, 1999–2005
- Mxit, 2005–2016
- MySpaceIM, 2006–2009
- Odigo Messenger, 2002–2004
- ooVoo, 2007–2017
- PowWow, 1994–2001
- Skype Qik, 2014–2016
- Surespot, – 2022
- Talk City, 2002
- Upptalk, 2010–2017
- Windows Live Messenger, 2005–2012
- Windows Messenger, 2001–2008
- Xfire, 2003–2015
- Yahoo! Messenger, 1998–2018