How do I add a O365 Shared Mailbox into a mail client?

I would like to add a shared mailbox into my mail client, how can I go about doing it? Thanks!
bcphangAsked:
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arnoldCommented:
What client is being used and the type of connection to the data IMAP/sync/pop3?
Using the web interface, On the mailbox below favorites, add shared mailbox.
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Damien KayCommented:
I'm assuming you are talking about a "Shared Mailbox" as defined in O365, not a user sharing their mailbox.  Once you give yourself permissions to the mailbox, it will automatically appear in your Outlook Client as another mailbox.  There are admin options to turn this behavior off, but it should be enabled by default.

In the EAC (Exchange Admin Center) edit the properties of the Shared Mailbox and Click on "mailbox delegation" and add yourself, or any other users that need it.

Within minutes, you should see the Shared Mailbox mounted in your Outlook client.
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bcphangAuthor Commented:
@arnold and @Damien, I'm trying to set it up in the default Mail.app on a Mac, using IMAP. I can access the shared mailbox on the web client, but I usually prefer to use a mail client.
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arnoldCommented:
I am unsure that you can access a shared mailbox usin an IMAP type account.  I'll check something and get back.
Access to shared mailboxes is auto added when the email client is outlook and is connecting using exchange sync/autodiscovery....
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bcphangAuthor Commented:
@arnold, yes I know that, just that we have just switched to O365 in my company, and most of us are used to using Mail on the Mac. Also, there are some users who are on the lower license, so they don't have Outlook provisioned for them.

Thanks for helping though, I have been trying but failing to do that..
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arnoldCommented:
Your best bet is the web based access.
The sync is available on mobile devices, I do not believe they allow the sync on the desktop clients.
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bcphangAuthor Commented:
I managed to find out how to set up the shared mailbox using IMAP for third party clients.

Exchange Configuration
USER EMAIL: user@maindomain.com
PASSWORD: password
SHARED MAILBOX: shared@anotherdomain.com (could also be @domain.com, of course)
SHARED MAILBOX ALIAS: shared-mailbox

Note: Please make sure to create the UNIQUE alias always with the mailbox, because it creates the user [alias]@maindomain.com. In this case shared-mailbox@maindomain.com


Settings for IMAP Configuration
EMAIL ADDRESS: shared@anotherdomain.com (shared mailbox)
IMAP SERVER: outlook.office365.com
SMTP SERVER: smtp.office365.com

USERNAME: user@maindomain.com\shared-mailbox  (user\shared mailbox alias)
PASSWORD: password (user's password)

SMTP LOGIN IS DIFFERENT

USERNAME: user@maindomain.com  (user's email)
PASSWORD: password (user's password)

Hope it helps anyone else trying to get this done!

ETA: Here's where I found the instructions: https://social.technet.microsoft.com/Forums/msonline/en-US/6369118f-7dee-4728-ac1c-a0c706b3d290/office-365-exchange-online-how-to-access-a-shared-mailbox-using-thunderbird-or-other-imap-client?forum=onlineservicesexchange
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bcphangAuthor Commented:
It works
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