So, IF I decide to switch from POP to IMAP on my Mac(, what do I do about my iPhone and iPad?
When you mix IMAP and POP on your different devices you have to be very careful. If you delete a message on one device (your iphone for example) before your Mac has an opportunity to download, then this message will not exist on your Mac. If you move a message on your Mac from the Inbox
I wasn't planning to run IMAP on my Mac and POP on my iOS devices. My question was about changing the iOS devices over from POP to IMAP. No, I have not tried to look that info up yet. My ISP does not provide any aid in switching on iOS devices, but it does for OS X.
I see that my Mac now shows an IMAP account and my POP account, with the IMAP account not enabled. It looks like some simple editing of the account details in the IMAP account would be all that's necessary since they don't match the settings in my POP account. I assume that if I switch the incoming port number will auto-switch (995 for POP 993 for IMAP), or do I have to manually edit there?
You can't change the setting in an account. You have to create as either POP or IMAP with correct settings. It's a bit like baking a cake in a round pan then trying to make it square.
We're not talking about the same thing here. Yes, you can edit some settings in your account. For example, the IMAP account that Apple installed, but did not activate, has the wrong user info, etc, and I can change that. If I don't edit that info, the account will be worthless.
Since you already have your account set as IMAP, you can disable POP and enable IMAP. If you delete the POP account, you must first move all messages in the Inbox to a folder under "On My Mac". Apple deletes the Inbox when you delete a POP account. If you delete an IMAP account then all IMAP folders are deleted. While it might seem that IMAP is the more risky of the two protocols, your messages are still on the server. You might have messages in your POP Inbox that no longer exist on the server. Once delted these messages could be lost unless you have Time Machine or other type of backup
Okay, thanks, I can copy and paste the inbox posts to an on my Mac box, or use Archive. I suppose that I'd need to do the same for my current Sent box, so that those posts would be preserved. Am I going to lose the rules currently in m,y POP acct if I switch? I have rules to move some incoming posts to mailboxes on my Mac, according to sender. Will i need to reset those rules after a switch to IMAP? After a switch, I assume that I can archive my inbox to the server, and there will be need to archive the on my Mac boxes.
I don't use Time Machine, I clone my internal to an external HD. I know that TM has benefits, but, it's not a bootable clone.
My main concern is that I keep the lion's share of my inbox posts, and all the posts in other on my Mac mailboxes. I like to be able to reference old posts from time to time, and I'm not sure how IMAP fits into that. <snip>
What happens to the posts that are currently in my various on my Mac mailboxes if I switch from POP to IMAP? Do they disappear?
You will still have all your old messages stored under the "On My Mac" folders. Just remember to move the current Inbox (POP) to a local folder before deleting the POP account settings. Alternatively, you can select the Archive function and they will be moved to the localArchive folder. When you Archive IMAP the messages are stored in a folder named Archive on the server.
Can I enable the IMAP account before I delete the POP acct? Or is this a one or the other situation? It would be nice to see what the IMAP acct looks like before I dump the POP acct, if possible.