I think I'm getting it. To be clear let me say my wish for how I'd like things to work.
Ideally, I'd like my work computer to be the center for my IMAP mail and then use my iPad, iPhone and home computer as "windows" into these IMAP emails and if I delete any they will still be available on my work iMac.
The point being that I get A LOT of these IMAP work emails so my personal devices are getting really full with lots of email that I really don't want there, but I do want/need the ability to check my work email to see if there is anything I need to deal with or do and then have the ability to delete them from my devices and home computer.
It's sound like I need to set up folders so I can move these emails out of my inbox when on my devices or home computer instead of deleting them to keep my inbox clean. And then if I do it this way, my work emails will still be available to me on my work computer in the folder I have placed them. And then in this way use folders to find my emails and work on things from the folders instead of from the inbox.
Am I getting closer to a way to use IMAP versus POP?
I just created a folder under my email that shows in the left column of my Apple Mail client on my Mac Pro home computer and dragged a work email into it as a test to see if the folder and email in it now will show on my work computer when I go in to work tomorrow.
I guess I can also check my devices and see if the folder was created there too, or if the folder was just a local folder on my Mac Pro.
I just checked my iPhone and the folder is THERE! as is the email I dragged inside it. That is kind of cool. Now I'm trying to move a work email in my inbox while on my iPhone into this new folder. COOL it worked! I just checked in my Mail client on my Mac Pro and it's there.
So.. I see that I just need to work differently than I have all these years using POP. I can see a bit more now why people like IMAP so much. Do it once and it effects all other devices and computers. I used to do everything a number of times one for each device. I could get very used to this 🙂
Can you change a POP account to IMAP? Or do you have to delete the POP account and recreate it as a IMAP account? But doing this will I lose all my saved emails, or because they're in local folders on my Mac Pro, they'll still be there?