Try using this for the database:http://www.codeproject.com/KB/database/ ... mssql.aspx
Please let us know how it works, because a lot of users may want to do the same thing.
You should already have your LAMP system setup when you want to move the data over. Then you can put the lastest archon into your apache www directory (or wherever it goes) making sure that packages/core/install.php is removed, and it should work fine.
One thing you need to make sure of, though, is to maintain the AUTO_INCREMENT numbers and the numbers in the ID fields. Or else your relationships will get all messed up.