Shared mailboxes are used when multiple people need access to the same mailbox, such as a company information or support email address, reception desk, or other function that might be shared by multiple people.
Users with permissions to the group mailbox can send as or send on behalf of the mailbox email address if the administrator has given that user permissions to do that. This is particularly useful for help and support mailboxes because users can send emails from "Contoso Support" or "Building A Reception Desk."
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External users: You can't give people outside your business (such as people with a Gmail account) access to your shared mailbox. If you want to do this, consider creating a group for Outlook instead. To learn more, see Create a Microsoft 365 group in the admin center.
Use with Outlook for Android and iOS App: In addition to using Outlook on the web from your browser to access shared mailboxes, you can also use the Outlook for iOS app or the Outlook for Android app. To learn more, see Add a shared mailbox to Outlook mobile. Another option is to create a group for your shared mailbox. To learn more, see Compare Groups.
Encryption: You can't encrypt email sent from a shared mailbox. This is because a shared mailbox does not have its own security context (username/password) so it cannot be assigned a key. If more than one person is a member, and they send/receive emails they encrypted with their own keys, other members might be able to read the email and others might not, depending which public key the email was encrypted with.
Subscription requirements: To create a shared mailbox, you need to subscribe to a Microsoft 365 for business plan that includes email (the Exchange Online service). The Microsoft 365 Apps for business subscription doesn't include email. Microsoft 365 Business Standard does include email.
Too many users: When there are too many designated users concurrently accessing a shared mailbox (the max supported is 25), they may intermittently fail to connect to this mailbox or have inconsistencies like messages being duplicated in the outbox. In this case, reduce the number of users or use a different workload, like a Microsoft 365 group.
Message deletion: Unfortunately, you can't prevent people from deleting messages in a shared mailbox. The only way around this is to create a Microsoft 365 group instead of a shared mailbox. A group in Outlook is like a shared mailbox. For a comparison of the two, see Compare groups. To learn more about groups, see Learn about Microsoft 365 groups.
Multi-Geo In a multi-geo environment, shared mailboxes need to be licensed the same way a user mailbox is licensed. Note that cross-geo mailbox auditing is not supported. For example, if a user is assigned permissions to access a shared mailbox in a different geo location, mailbox actions performed by that user are not logged in the mailbox audit log of the shared mailbox.
To access a shared mailbox, a user must have an Exchange Online license, but the shared mailbox doesn't require a separate license. Every shared mailbox has a corresponding user account. Notice how you weren't asked to provide a password when you created the shared mailbox? The account has a password, but it's system-generated (unknown). You shouldn't use the account to log in to the shared mailbox. Without a license, shared mailboxes are limited to 50 GB. To increase the size limit to 100 GB, the shared mailbox must be assigned an Exchange Online Plan 2 license. The Exchange Online Plan 1 license with an Exchange Online Archiving add-on license will only increase the size of the archive mailbox. This will also let you enable auto-expanding archiving for additional archive storage capacity. Similarly, if you want to place a shared mailbox on litigation hold, the shared mailbox must have an Exchange Online Plan 2 license or an Exchange Online Plan 1 license with an Exchange Online Archiving add-on license.
If you see the error message, The proxy address "smtp:" is already being used by the proxy addresses or LegacyExchangeDN of "". Please choose another proxy address, it means you're trying to give the shared mailbox a name that's already in use. For example, let's say you want shared mailboxes named info domain1 and info domain2. There are two ways to do this:
This message appears when Microsoft 365 is experiencing a replication latency issue. It should go away in an hour or so, when the information about your new shared mailbox (or added user) is replicated across all of our data centers. Wait an hour and then try again to send a message.
A shared mailbox is a mailbox that multiple users can use to read and send email messages. Shared mailboxes can also be used to provide a common calendar, allowing multiple users to schedule and view vacation time or work shifts.
A shared mailbox is a type of user mailbox that doesn't have its own username and password. As a result, users can't log into them directly. To access a shared mailbox, users must first be granted Send As or Full Access permissions to the mailbox. Once that's done, users sign into their own mailboxes and then access the shared mailbox by adding it to their Outlook profile. In Exchange 2003 and earlier, shared mailboxes were just a regular mailbox to which an administrator could grant delegate access. Beginning in Exchange 2007, shared mailboxes became their own recipient type:
In previous version of Exchange, creating a shared mailbox was a multi-step process in which you had to use the Exchange Management Shell to complete some of the tasks. In Exchange 2013 and later, you can use the Exchange admin center (EAC) to create a shared mailbox in one step. For details, see Create shared mailboxes in the Exchange admin center. In fact, the EAC has a feature area devoted entirely to shared mailboxes. Just navigate to Recipients > Shared mailboxes to view all the management tasks for shared mailboxes.
Full Access: The Full Access permission lets a user log into the shared mailbox and act as the owner of that mailbox. While logged in, the user can create calendar items; read, view, delete, and change email messages; create tasks and calendar contacts. However, a user with Full Access permission can't send email from the shared mailbox unless they also have Send As or Send on Behalf permission.
Send As: The Send As permission lets a user impersonate the shared mailbox when sending mail. For example, if Kweku logs into the shared mailbox Marketing Department and sends an email, it will look like the Marketing Department sent the email.
Send on Behalf: The Send on Behalf permission lets a user send email on behalf of the shared mailbox. For example, if John logs into the shared mailbox Reception Building 32 and sends an email, it look like the mail was sent by "John on behalf of Reception Building 32". You can't use the EAC to grant Send on Behalf permissions, you must use Set-Mailbox cmdlet with the GrantSendonBehalf parameter.
In previous versions of Exchange, you could use a regular mailbox as a delegated mailbox. If you have delegated mailboxes, you can use the Exchange Management Shell to convert those delegate mailboxes to shared mailboxes. For details, see Convert a mailbox in Exchange Server.
A shared mailbox makes it easy for a group of people to monitor and send email from a public email alias like info
contoso.com. When a person in the group replies to a message sent to the shared mailbox, the email appears to be from the shared address, not from the individual user. In classic Outlook, you can also use the shared mailbox as a shared team calendar.
Any member of the shared mailbox can create, view, and manage appointments on the calendar, just like they would their personal appointments. Everyone who is a member of shared mailbox can see their changes to the shared calendar.
After your admin has added you as a member of shared mailbox, close and then restart Outlook. The shared contact list associated with the shared mailbox is automatically added to your My Contacts list.
In the folder pane on the left, locate the Shared with me folder. Click it to expand it. Your shared mailbox is a subfolder under Shared with me. When you select the name of the shared mailbox there, it will expand to show the standard email folders, such as Inbox, Drafts, and Sent Items.
due to the fact we have recently switched to office365 we would like to use a shared mailbox as our main support E-Mail for osTicket. Unfortunately osTicket does not suppor this (to my knowledge)
ramrajone it would cost us monthly if we had to create our own user for support in office365. Therefore I hope that someone has a detour (mod) for it since the shared mailbox authentication error resul due to the programming of osTicket.
Our problem is that with the switch to office365 there is no way to create a user mailbox which you don't have to pay monthly. For this reason I can imagine that several companies will now use shardes mailboxes as a workaround. Otherwise it is not worth using an open solution like osTicket if you have to pay 20$ per month for an e-mail account, then you can just as well switch to zendesk or other providers.
ramrajone of course you're right i only had the price in mind that we pay for our users. It's about $4-5, despite all this it makes it almost impossible for office365 users to use osTicket for free anymore just because osTicket does not want to support shardes mailboxes.
ramrajone I understand your point of view, too. I think it's just a pity that of all the projects I use only osTicket seems to intentionally not allow shared mailbox. But we could certainly keep exchanging our opinions here all day but this won't help me or any other osTicket user who wants to use shared mailbox.
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