There is a lot of information in OpenText™ | MySupport. Therefore, I have created an overview of all releases since 6.5. And the last available updates, for each release.
Of course you should always update to the last mainrelease. But an overview, e.g. For migrations or other tasks, can not hurt :)
Product: Management Server
Version: 16.0
Last Update: ServicePack 1, Hotfix 8, Build 16.0.1.980
Product: Delivery Server
Version: 16.0
Last Update: ServicePack 1, Hotfix 2, Build 16.0.1.780_SP1_HF2_201705181318
Release Date: March 2016
Sustaining: March 2021
Product: Management Server
Version: 11.2
Last Update: ServicePack 2, Hotfix 37, Build 11.2.2.1383
Product: Delivery Server
Version: 11.2
Last Update: ServicePack 2, Hotfix 13, Build 11.2.2.521_SP2_HF13_201706121613
Release Date: December 2013
Sustaining: December 2018
Product: Management Server
Version: 11.1
Last Update: ServicePack -, Hotfix 19, Build 11.1.0.1129
Product: Delivery Server
Version: 11.1
Last Update: ServicePack -, Hotfix 9, Build 11.1.0.384_HF9_201505041118
Release Date: May 2013
Sustaining: May 2016
Product: Management Server
Version: 11.0
Last Update: ServicePack 1, Hotfix 15, Build 11.0.1.703
Product: Delivery Server
Version: 11.0
Last Update: ServicePack 1, Hotfix 10, Build 11.0.1.629_SP1_HF10_201604242044
Release Date: February 2012
Sustaining: February 2015
Product: Management Server
Version: 10.1
Last Update: ServicePack 2, Hotfix 25, Build 10.1.2.462
Product: Delivery Server
Version: 10.1
Last Update: ServicePack 2, Hotfix 10, Build 10.1.2.612_SP2_HF10_201403261040
Release Date: July 2010
Sustaining: August 2013
Product: Management Server
Version: 10.0
Last Update: ServicePack 1, Hotfix 15, Build 10.0.1.150
Product: Delivery Server
Version: 10.0
Last Update: ServicePack 1, Hotfix 6, Build 10.0_SP1_HF6_201105022303
Release Date: July 2009
Sustaining: July 2012
Product: Management Server
Version: 9.0
Last Update: ServicePack 1, Hotfix 15, Build 9.0.1.95
Product: Delivery Server
Version: 9.0
Last Update: ServicePack 1, Hotfix 9, Build 9.0_SP1_HF9_201101301802
Release Date: December 2008
Sustaining: December 2011
Product: Management Server
Version: 7.5
Last Update: ServicePack 2, Hotfix 4, Build 7.5.2.35
Product: Delivery Server
Version: 4.0
Last Update: ServicePack 1, Hotfix 26, Build 4.0.1.8 SP1/HF26
Release Date: December 2006
Sustaining: June 2010
... ist Senior Site Reliability Engineer bei der Vodafone GmbH in Düsseldorf. Seit dem Jahr 2007 betreut er zusammen mit seinen Kollegen die OpenText- (vormals RedDot-) Plattform Web Site Management für die deutsche Konzernzentrale.
Er entwickelt Erweiterungen in Form von Plug-Ins und PowerShell Skripten. Seit den Anfängen in 2001 (RedDot CMS 4.0) kennt er sich speziell mit der Arbeitweise und den Funktionen des Management Server aus.