MS SQL Server 2012 is supported by OpenAccess ORM in Q1 2012 SP1 and Q2 2012. You can refer to our upgrade article for some more information regarding how to change the OpenAccess ORM version you are using once you have installed the new one.
The good news are that the OpenAccess ORM Free Edition is now released without any functional limitations, so you can directly download and use it. On the other hand, in case you would like to receive 24h priority support package you should go for our Premium or Ultimate Collection.
Let us know if you have any other questions.
the Telerik team
OpenAccess ORM Q2'12 Now Available! Get your hands on all the new stuff