Shared Mailbox?

Hi,

I've been doing a lot of reading on this topic, I'm just finding a lot of doco that's potentially out of date now?

System: Red Hat Enterprise Linux Server release 7.2 (Maipo) dovecot-2.2.10-5.el7.x86_64

The need:

1. I'd like to create a mailbox called "accounts", email would simply get delivered to the account via "accounts@example.com" (Maildir format)
2. Share this mailbox so it appears in three other accounts as an extra folder called "accounts"
3. If a user reads an email in the "accounts" folder, I'd like the other users to know this.

Clients:

• Latest Thunderbird
• Outlook 2013.

Any advice welcome ;)

Cheers,

Craig