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I need to grant full mailbox access to a group through Active Directory so that they can view, forward and send mail from each other's mailboxes. I need to do this through AD rather than by having each user share his/her calendar through Outlook. <br />
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In AD, I already went to Exchange Advanced--&gt;Mailbox Rights and added the group to each user's mailbox rights. I checked the Full Mailbox Access box, but the users can only view each other's mailboxes. They can't forward or send new mail. 
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I need to grant full mailbox access to a group through Active Directory so that they can view, forward and send mail from each other's mailboxes. I need to do this through AD rather than by having each user share his/her calendar through Outlook. 

In AD, I already went to Exchange Advanced-->Mailbox Rights and added the group to each user's mailbox rights. I checked the Full Mailbox Access box, but the users can only view each other's mailboxes. They can't forward or send new mail. 

Exchange 2003: Grant full mailbox access including the ability to forward and send

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.

Email Protocols

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Outlook

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.