Been awhile since I've worked at one but it is usually grounded in trying to achieve 100% MS usage.
It is rarish to find a partial MS shop. Most of this is how hard MS makes it to use other tools. Even in 2025 they have good interop with external tools hamstrung.
Example: SQL Servers JDBC driver will convert an entire table's of data from ASCII to UTF and a full table scan instead of convertering your UTF bind to ASCII and using the ASCII based index. This doesn't break interop but does make it painful to code and one more reason to just use .Net.
There is no way a reasonable person would not deploy to Linux and postgres for cost reasons alone. No one wants to pay Microsoft or Oracle money for databases, operating systems or frameworks nowadays.
All my .Net web apps are now deployed to Linux and Sqlite. Good riddance to Windows Server and IIS (which was dogshit from day one). With the tiny memory profile of .Net 10 it's crazy how small a VM you need to get good performance.
It is rarish to find a partial MS shop. Most of this is how hard MS makes it to use other tools. Even in 2025 they have good interop with external tools hamstrung.
Example: SQL Servers JDBC driver will convert an entire table's of data from ASCII to UTF and a full table scan instead of convertering your UTF bind to ASCII and using the ASCII based index. This doesn't break interop but does make it painful to code and one more reason to just use .Net.