The problem I'm finding, is after changing from POP3 to IMAP, all folders are sync'd to my server.
Even if I unsubscribe a folder, restart Outlook, if I delete an email in that folder, it deletes on the server. Same if I delete something on the server it deletes on my PC (in the unsubscribed folder). Seems the subscribe/unsubscribe does nothing.

This is interesting and I wonder if it would help me. I sometimes have 'space' issues with our email...i.e. we keep everything and go over our limit with our provider. If I were to create a folder and 'unlink' it from IMAP, would that remove the emails from our server...therefore free up space?

I am using an Outlook 2016 email client that has an IMAP connection to a Gmail server, and did not find this method to be completely effective. I was able to disable subscribing for some folders, but there is a group of folders for which unsubscribing is disallowed: [Gmail]/Drafts [Gmail]/Sent Mail [Gmail]/Spam [Gmail]/Trash [Gmail]/Inbox [Gmail]/Sent Items When I attempted to unsubscribe from these folders, in each case I got a message stating that I could not unsubscribe from that folder, that it was a special folder and could not be unsubscribed from in Outlook. For several years, I have used my Outlook Inbox and Sent Mail as email message repositories, saving emails from different mail servers. Synchronization with the Gmail server deleted all messages not found on the Gmail server, which included all of my email history from previous email accounts. So, this limitation had a great impact on me, and perhaps other users as well. Every time I perform a Send/Receive operation, these folders are synchronized, greatly extending the time it takes for a Send/Receive to complete. I don't know if this problem only occurs with Gmail accounts, but it is a significant limitation to the method, and I would suggest that a note be added to the description advising users of this potential limitation. --Ralph Perry

I have inadvertendly unsubscribed from an IMAP folder that I can now no longer re-subscribe to. When sending an empty Query in the IMAP Folders dialog, the folder used to show in the "Subscribed" tab, but not the "All" tab. I had selected the folder in the "Subscribed" tab and clicked Unsubscribe. The folder disappeared from the list. I want to re-subscribe to the folder, preferrably without having to delete and re-setup the entire IMAP account. But I can't get the folder to show up in the "All" tab to re-subscribe to it. The folder still shows up in Outlook's folder pane for said account. Any hints?