The future of Microsoft Solver Foundation is highly uncertain. See for instance the recent thread at the Solver Foundation Forum. Therefore, the upcoming MOSEK version 7 does not include support for Solver Foundation and we can only offer limited support for using Solver Foundation within MOSEK version 6.
Currently, we advice MOSEK users to employ the MOSEK optimizer API or the MOSEK Fusion API instead of Solver Foundation on the Microsoft .NET platform. If Solver Foundation becomes an actively developed product again we will of course work with the new development team to have MOSEK support.