This is an additional add-in that can be loaded when necessary. It is not installed by default. The Solver add-in allows you to perform "what if" calculations based. In Excel for Windows, if you don't see the Solver command or the Analysis group on the Data tab, you need to load the Solver add-in. 1. Click the File tab, click. The Solver Add-in is an add-in program in Excel. Solver is not available for Excel on mobile devices. On Windows, OpenSolver should work with Excel and later; we test it on 32 Windows July Office Security Update Microsoft updated the security. Solver is a Microsoft Excel add-in program you can use for what-if analysis. Use Solver to find an optimal (maximum or minimum) value for a formula in one cell. The Solver add-in is included with all versions of Microsoft Excel beginning with , but it is not enabled. With this Solver add-in, created by Frontline Systems, developers of the Solver in Microsoft Excel, you can define and solve optimization problems in your Excel. On the Data tab, in the Analyze group, click Solver. Click Solver Click Add to enter the following constraint. Add Constraint. 6.