Let's Encrypt now holds 35% of the market
I wish they would make Microsoft IIS a first class citizens. If they are true to their mission they should set any political reasons aside, and provide official support for all platforms. AFAIK there are no technical reasons that prevents them to implement support for IIS and Azure Web Sites. There are a number of user created solution for both, that works well, but i would feel more comfortable with using that in production with official vendor support. So either Microsoft should fund this or lets encrypt should and i wonder why none of them has.