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This is not possible. You can use OWA on the mobile device and view the shared mailbox that way if you choose. If its a normal shared mailbox the user AD object associated the shared will be disabled anyway, so you can't add it. Also the mobile device mail client doesn't function like an outlook client where you can see both mailboxes. If the shared mailbox AD object isn't disabled then you can add the mailbox to the mobile device like any other mailbox.
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This is not possible. You can use OWA on the mobile device and view the shared mailbox that way if you choose. If its a normal shared mailbox the user AD object associated the shared will be disabled anyway, so you can't add it. Also the mobile device mail client doesn't function like an outlook client where you can see both mailboxes. If the shared mailbox AD object isn't disabled then you can add the mailbox to the mobile device like any other mailbox.

iphone-IMAP-shared.JPG

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Or you can give a password to the shared mailbox by the &quot;reset password&quot; in Active Users then Add that Shared mailbox in your iphone as a regular exchange user.
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Or you can give a password to the shared mailbox by the "reset password" in Active Users then Add that Shared mailbox in your iphone as a regular exchange user.

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@Repil makes are really good point. I always forget about IMAP and POP.
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@Repil makes are really good point. I always forget about IMAP and POP.

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A user has been given full access to an Office 365 shared mailbox and also has full rights to send email from the Office 365 shared mailbox account.<br />
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What steps need to be followed to add this shared mailbox account to the user's iPhone X?<br />
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This user's primary Office 365 email account (which has full access to the Office 365 shared mailbox account) has already been set up within the iPhone X mail program on the iPhone X.
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A user has been given full access to an Office 365 shared mailbox and also has full rights to send email from the Office 365 shared mailbox account.

What steps need to be followed to add this shared mailbox account to the user's iPhone X?

This user's primary Office 365 email account (which has full access to the Office 365 shared mailbox account) has already been set up within the iPhone X mail program on the iPhone X.

Set up Office 365 shared mailbox within iPhone X

Microsoft Office is an integrated suite of applications that includes Outlook, Word, Excel, Access, PowerPoint, Visio and InfoPath, along with a number of tools to assist in making the individual components work together. Coding within and between the projects is done in Visual Basic for Applications, known as VBA.

Microsoft Office

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.

Exchange

The iPhone is a smartphone made by Apple Inc. It and the iPad, along with several other mobile devices from Apple, run on the iOS operating system, which has its own topic, as does the iPad for device-specific questions. Native iOS applications are written in Objective-C or in Swift using the Cocoa Touch frameworks or HTML5 compiled with the help of a package manager such as Adobe PhoneGap; a common IDE is Xcode.

iPhone

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.

Microsoft 365

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.