I think that only SQL server Standard or Enterprise are currently supported.
Check this thread here where the guys managed to do it on SQL Express:
http://www.k2underground.com/forums/2/25099/ShowThread.aspx
Installed Point Beta 1 on SQL Express, here are the steps I had to follow:
- Open SQL Server Configuration Manager, expand SQL Server 2005 Network Configuration, Protocols for SQLEXPRESS, Enable Named Pipes.
- Open SQL Server 2005 Surface Area Configuration, select Surface Area Configuration for services and connections, Expand Data base Engine node and select Remote connections in the tree view, Under Local and remote connections select a option that include named pipes.
Make sure to add your database name in the K2 configuration as TESTSQL\SQLEXPRESS