I have 14+ years experience working with MS SQL Server and for the last year I have been working as an Oracle Database Developer. On the developer side of things it is not too difficult to transfer your development skills between the two. There are differences that may take some time to understand and adapt too, but I found it fairly easy to make the move.

Where there is a greater difference is between being a MS SQL Server DBA and an Oracle DBA. The concepts are the same but the how you do things is much different.

You have to decide if it is worth the move and if so show how your skills can transfer.

Also, if you are trying to find other companies using SQL Server, the best thing you can do is look for your local SQL Server Users Group. That is one of the best places to stat your networking.