OAK 4, a major upgrade to the product, was released on 8 April 2009.
The latest version of OAK, version 4.10.000, released on 12 June 2010, introduces new features, implements various bugfixes and performance upgrades, and amendments to the help (offline, online and printable PDF).
New features include:
Users of prior versions of OAK 4 will be automatically offered the chance to install the new version by OAK’s automatic updating feature.
There is a detailed version history of OAK in the online documentation.