You've never worked for a gov office have you? Getting any kind of new policies or tools added or updated when it comes to infra and IT can take years, if not decades. I would not be surprised if the one I volunteered at 10 years ago when I got my start is still on Lotus Notes.

Why not? It's still developed.

https://en.wikipedia.org/wiki/HCL_Domino

There is a reason there are no screen shots on that page showing what the GUI actually looks like.

free speech I think