On 2016-10-28 02:15:45 +0000, *Hemidactylus* said:
> Have you tried Settings - Mail - Accounts to see if Mail is unticked?
You were right. It was unticked, which somehow made Mail dispappear.
I ticked it back, and Mail re-appeared. I wonder how it got unticked
in the first place; it certainly wasn't me. I also wonder why the App
Store would allow me to download another copy of Mail, if the first one
was never really removed.
Thanks for your help!