> In the old days, we would have cried about 150MB memory usage idle as being bloat.

I'm curious how much of those 150 are things that can't be boiled down to 'text', since that should be roughly the same size as on completely un-bloated software. The database of emails, the plain text of said emails, and all the basic UI should all be nothing but text and take up next to nothing.

Images on the other hand. I'd imagine Outlook Classic hasn't been made with 1 MB PNGs for all their icons, so it's probably not that that's pulling the memory usage, although it's probably contributing. Meanwhile, New Outlook (New) probably didn't optimise a single thing, so it probably is using 1 MB icons, which then quickly piles up. Not to mention the whole webview rendering backend, since we apparently can't make anything without going through a few layers of abstraction first.