If you install SQL Server Express Edition, ensure that the server software and hardware meet the requirements listed. The memory and CPU limitations are sufficient to support 5 concurrent users. This version is limited to 1 CPU, 1 GB of memory, and 10 GB of data. When you install a new instance of SQL Server, SOLIDWORKS installation provides a free version of Microsoft SQL Server Express. You can use an existing SQL Server database if it is already installed on the system, or install a new instance as part of the SOLIDWORKS Electrical installation. You must insure that an instance of the SQL Server database is available for any type of SOLIDWORKS Electrical installation.