yes this was the article I read but unfortunately either Zimbra and/or my administrators don't provide this capability.
Is there any reason why the Trash IMAP server (shown in Zimbra) is not listed in AquaMail? that would solve the all issue as I would be able to sync it with the Deleted AquaMail folder!
See a few screenshots to illustrate what I see
Let me try to help you understanding how things work.
You have the Server that keep all mail and everything else (Zimbra, Outlook, Aquamail) communicate with the server, and sync the folders and messages with the server. Each of them have their own mapping.
And for the proper functionality, what matters is which folder is internally considered as "Trash/Deleted.." by the server, not the names per se. (So, creating new folders with those names would not do any good.)
Now, let me list together the facts from your postings.
1. Outlook is connected via IMAP to the server.
2. Outlook seems to sync the "Deleted Items" folder to the internal "Deleted/Trash" folder, because we see it showing up in "Trash" folder in Zimbra (which is configured by your sysadmins, and we hope that was done properly).
If all of this is correct, that suggests that the IMAP server does offer the "deleted/trash" folder via IMAP. Then it is a surprise that Aquamail sees all other server side folders, but not this one.
So, there are the following possibilities that could answer this contradiction:
1. Aquamail has a bug showing a folder.
(This is unlikely, because that part has been tested many times on many servers.)
2. The server has a bug that causes it not showing that folder exclusively to Aquamail.
(This is possible, but not very likely either.)
3. You are not recognizing that folder in the long list of server-side folders (e.g. because it is named something else: "Deleted", "supprimé", or ...).
(This is not totally impossible, but unlikely at thist point...)
4. One of the connections (Outlook's or Aquamail's) is not set as IMAP, but rather as EWS (in Aquamail) or Activesync (in Outlook).
If that's the case, it would mean that the server is not showing that folder via one of those two connections (possibly due to the server-side configuration or some weirdness..)
This is quite possible. So, - I suggest that you double check how your connection is set in both Outlook and Aquamail.
And then, maybe you can tell where "Deleted Items" is pointing in your Outlook settings? You wrote it starts with "//" what's after that?
The name that comes after that may give some clues as for what is the actual name for that "deleted/trash" folder on the Server.
Besides this, you can save a debug log and send it to the developer, Kostya (see information at the signature below any of his postings.) He might have a more clear suggestion of how to capture that log, but I'd think this would do:
start the log, and enable to options that he requests in that description. Then go to "other folders" (e.g. from the pull-down "drawer" in the left-top corner), and let all folders load.
Then stop the debug log, and send the file as described in the instructions.
PS. I see that Kostya just has posted his response, - but I still think my suggestions might be helpful.