@cstross @dwaites @ptrc I run my own mail server, and I've got one mailbox that's probably 200 GB of random, mostly unimportant crap. I've been thinking about using the new Outlook in some VM, and add that mailbox just to see what'd happen (and if Microsoft would try to cache it all on their servers).
@jernej__s @cstross @ptrc would be interesting to see if they slurp it all or just envelopes. In IMAP you can choose.