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I have some users that should not "have" their own mailboxes but should only be allowed to work with a shared mailbox. I failed in accomplishing just that.

So my question is pretty simple: How can I make sure that some selected users do not "have" their own mailbox but can only work with some shared mailbox I gave them Full Access permissions for?

I already tried removing the Exchange licenses from these users - but unfortunately they cannot use any Exchange/Outlook based services (like the Outlook Web App) anymore then.

EDIT 2015-10-04: Added following information.

Concerning the "what and why": I have a group of (partially external) people that manage some very specific project for my organization. These users should be allowed to work with the (shared) project mailbox (reading & sending mails there). Since some of them are not part of my organization and others are on an organizational level that is not high enough to grant them own mailboxes (with which mails could be send or received), I don't want these users to "have" (or to put it differently: to be able to properly use) own individual mailboxes.

Our Office 365 subscription level is Office 365 Small Business for Nonprofits.

Hauke P.
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To be clear there is a distinction between "Shared Mailbox" and a "User Mailbox". Both can have different users granted access.

A user can not access a "Shared Mailbox" without a primary account to logon to. Shared Mailboxes do not have their own logons.

You can have a "User Mailbox" with a primary username and logon and share it with other users. You can share this logon and other users can access it, or users can use their logon and gain access thru rights granted to them.

To Accomplish your scenario you need to have a shared logon. If you assign these users an Exchange license than a mailbox is automatically provisioned. You could try to force delete their mailbox but that will likely cause other issues so I don't recommend it.

If I had a bit more information on the "What and Why" I may be able to provide some further guidance (What is the reason you don't want them to have the mailbox, and what Subscription level to Office 365 do you have).

Jesus Shelby
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Try to use the Alias function in the shared mail account configuration. With alias you can create as many name as you like but they all will use the same email account.

Bao Ctv
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