You might want to customize it a bit more to make it clear this is an offical blog. For a few seconds when reading this on mobile I was super confused if this was official or just someone outside MS writing about it.

Microsoft uses a .NET static site generator for company blogs similar to Hugo.

I don't think there's a public blogging software unless you count Sharepoint but I doubt that would scale well. Still Microsoft has a number of web products that could be used instead of Medium. A lot of the smaller Microsoft weblogs use Azure websites with Wordpress and the bigger ones are part of Micrsoft's in-house multisite.