Xpert-Timer runs on Windows XP, Windows Vista, Windows 7, Windows 8 and Windows 2003 Server, 2008 Server and 2012 Server (incl. Small Business Server).
Xpert-Timer includes an SQLite database for single users, and an Access database for multi users. We suggest to use the Access database with a maximum of 3 users. If you plan on running Xpert-Timer with more users, you should install a MS-SQL Server. The free Express Version of MS-SQL 2012 or 2008 is perfectly fine. Here you find more information about the server and the server setup:
http://www.microsoft.com/express/sql/default.aspx
You can also use a MySQL database with Xpert-Timer.