Missing Mail sub-folders in Mail?
Overnight about 30 sub-folders have gone missing in Mail.
They are important folders as they relate to work clients.
I've tried to "Rebuild" but nothing happened.
Any idea what the problem is or how I retrieve the sub-folders?
I have back-ups to Time Capsule but am reluctant to use that as I sent and received some important mails this morning before I noticed the sub-folders are missing.
Thank you
MacBook Pro with Retina display, OS X El Capitan (10.11.5), + iPhone 6 Plus & iPad Air 2