Microsoft SQL Server 2014 Express LocalDB is a software program developed by Microsoft. The most common release is 12.0.2000.8, with over 98% of all installations currently using this version. The setup package generally installs about 37 files and is usually about 532.68 KB (545,464 bytes). Relative to the overall usage of users who have this installed on their PCs, most are running Windows 10 and Windows 7 (SP1). While about 50% of users of Microsoft SQL Server 2014 Express LocalDB come from the United States, it is also popular in United Kingdom and Italy.Program details.