osTicket v1.10 (stable) and Maintenance Release v1.9.15 are now available! Go get it now
I´ve managed to port the full database to mssql.
Simply use Xampp and install osticket. Then create an empty database named ost in MSSQL (I used MSSQL2008)
Use the converter from http://www.convert-in.com/
(trial version is enough) ,
to connect between mysql and mssql and convert directly between the servers.
I´m currently in the process of changing connectors in the code.
I´ll post the results after testing.