derTonemeister

I am trying to replicate between two databases. One of them is Microsoft SQL database and it is running on my server. I'm wondering if I can have a free database that can run on my laptop in offline mode and that can talk to my MSSQL server both ways. I want to be able to replicate these databases (MSSQL vs. the free database) both as a publisher and as a subscriber. Do you know if this is possible?
Can this be done by using MS SQL Server Express? (main server running MS SQL Server.. and laptop running the express version).