Unfortunately "something windows specific" was pretty broad.

Between MSMQ, WCF over named pipes, MSDTC, and MSI installers, there's a lot to replace that is hard to provide the same guarantees or performance with straight replacements, if they even exist.

The end goal, being on modern dotnet, is better, but it's difficult to get there with a phased approach without accepting a temporary worsening, which is often hard to sell.

Especially while Framework is still supported.