We are maintaining (additionally to standard user mailboxes for each single user) different public mailboxes in our Pmail/Mercury network installation, where different users could simultaneously woking at. This works fine so far, but these special public mailboxes are not accessable via Mercury IMAP server, where you could subscribe only own (standard user) mailbox folders.
The problem is, that we have to get access to these public folders also from remote, e.g. for home and street workers. Now we've got the thought to migrate the public folders with there single e-mail files back to a standard user mailbox, where users could get access via IMAP. We are already using Roundcube (Webmail GUI) for getting access to our mailboxes from remote via Mercury I. Works also fine.
Now the question: Is it possible that different users have simultaneous access to one Pmail standard mailbox when accessing via IMAP? When accessing via Pmail the mailbox is being locked, but is the mailbox locked by IMAP as well? I darkly remember that this topic was already discussed in past, when users would like to get access via their iPhones and IMAP. Maybe anybody could state its experience whether this way works or not.