So these are GW mailboxes that were only accessed via IMAP?  And we want to remove those mailboxes, but not any email that was sent to other mailboxes?

No, one is a Gmail account; the other is another domain accessed via IMAP. The email from both those accounts is being accessed by the GroupWise client and saved on the GroupWise server. If some email has has been moved to other folders the user has that is not related to the IMAP account, the email can stay or go.

Ahh!  And you don't want to just stop the accounts from connecting, but to clear out those folders as well.

I haven't done that combination for ages. I ran into problems switching GW accounts in years past that I really couldn't do that (it kept associating my IMAP accounts with a GW Mailbox), so my IMAP is all on Thunderbird, but then I never posed as 'Normal' ;)

Sounds like something that could be tested. Set up a GW account for this test. connect to some IMAP account to get the same setup, with some emails moved over and visible via another client (WebAccess, Win client on other system, ..)

and then delete that IMAP account from GroupWise.

On this GW client, incoming email from each of the IMAP accounts is delivered to a specific folder for each IMAP account, not the main GW Mailbox.

If I delete the email in GroupWise folders used as the mailboxes for these IMAP accounts it will, of course, delete the email from the source accounts so I don't want to do that.

One way or the other I will have to delete the IMAP accounts from the GroupWise client. Once I do that I assume I will no longer see the folder structure associated with each of the IMAP accounts in the GroupWise client. What I'm trying to determine is if this action will also delete the email from the GroupWise server.

I just did a search (<Ctrl>+F) from the GroupWise client: it will return results from the IMAP accounts. Having verified this, if deleting the IMAP accounts does not remove the messages from the server, I can try deleting them manually.

I'll let you know what happens...

I have the bits to check that out if you'd like, an 18.3 system, and IMAP accounts I can use.

Big question is: cached or on-line for the GW mailbox?

Okay, I removed the IMAP accounts.

The folders associated with those accounts are gone from the GW client.

When I try to find email from those domains, email that was copied into the user's other GroupWise folders are found.

The only way I can think of to verify that the email has been deleted from the server is to run mailbox maintenance and see if any additional space has been recovered.

Kevin Boyle said:

The only way I can think of to verify that the email has been deleted from the server is to run mailbox maintenance and see if any additional space has been recovered.

Or, I can simply look in the trash.

A few minutes later I saw hundreds of messages in the trash from the domains whose IMAP accounts I just removed. They even show the folder name where they resided. 

So you can retain or purge as you so desire.  Good to know.

If you do not have remote mailboxes for this user, all should be well.

With remote mailboxes it could be, that the trashed mails come back later. If you have remote mailboxes, the users should access all mailboxes and set them to only sync with groupwise and then refresh them. That way the changed settings are applied before a sync with the imap servers happens. I had some strange experiences with remote mailboxes, whose settings got back to the server etc. before the new settings at the server were applied to the remote mailbox - but not really difficult to overcome if only few mailboxes are affected.

Prindl said:

With remote mailboxes it could be, that the trashed mails come back later.

Good point. When documentation is scarce, feedback from community members helps a lot.