The system won't move even one old email of any type to a new mailbox I created. Dragging, selecting and move to - always get an error message. OS High Sierra 10.13.2. I had no problem with it the other day. I rebuilt mailboxes as well.
Why aren't you on 10.13.6???
Safe Boot, (holding Shift key down at startup), does the problem occur in Safe Mode?
Safe mode attempts to repair Disks & clears lots of caches & loads safe Drivers, & prevents loading of 3rd party extensions, so if Safe Mode works try again in regular boot.
Any Mac that runs 10.13.2 can run 10.13.6
Using an Imac, so 10.13.2 is newest version. I tried it and it didn't improve anything. I backed mail up to Time Machine, deleted mail accounts and updated them. Lot of memory and hard drive. Ran disk utility and everything checks out okay. Doesn't really seem to work and still seems really slow. Each time Apple has an update, seems things get bogged down.
The only update available on my mac is speedtest for ookla.
Did you try the Link Above?
I used to just always go to Apple Menu and click on software update to download updates and it showed only Ookla update and nothing else. Weird.
No idea why it missed several updates...are you at 10.13.6 now?
Can't move mail from inbox to new mailbox I created.
