I think .NET is Microsoft's best product, followed very closely by MSSQL.

SQL Server has some incredible 3rd party tools build up around it. 3~4 Red Gate tools can one-shot your entire devops lifecycle.

I still prefer SQLite for anything that can handle reasonable, non-zero recovery point objectives. But, if it's serious business and we cant drop anything on the floor I am reaching for MSSQL without even blinking.