How do you share a mailbox with another user in Office-365?

In a typical organisation with a Microsoft Exchange server you would select your mailbox in Outlook, right-click > Properties > Security, then give the user the appropriate permissions.  However in Office-365 this approach does not work, instead you have to delve into the inner working with PowerShell.

1. Click Start > All Programs > Accessories > Windows PowerShell > Windows PowerShell.
2. Run the following command:
   
   
   

   $LiveCred = Get-Credential
3. In the Windows PowerShell Credential Request window that opens, type the credentials of an account in your cloud-based organization. When you are finished, click OK.
4. Run the following command:
   
   
   

   $Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell/ -Credential $LiveCred -Authentication Basic -AllowRedirection
   Note   The AllowRedirection parameter enables cloud-based organizations in datacenters all over the world to connect Windows PowerShell to the cloud-based service by using the same URL.
5. Run the following command:
   
   
   

   Import-PSSession $Session
   A progress indicator appears that shows the importing of commands used in the cloud-based service into the client-side session of your local computer. When this process is complete, you can run these commands.
6. To view the available mailboxes, run the following command:
   
   
   

   Get-Mailbox
7. Run the following command:
   
   
   

   Add-MailboxPermission -Identity <mailboxToShare> -User <userToAccess> -AccessRights FullAccess -InheritanceType All
   Note  <mailboxToShare> and <userToAccess> can both be replaced by the respective user's email addresses.


8. To disconnect PowerShell run the following command:
   Remove-PSSession $Session

To now add the mailbox to Outlook.  From Outlook do the following:

1. On the Tools menu, click E-Mail Accounts.
2. Click View or change existing e-mail accounts, and then click Next.
3. In the list, click the Exchange account type, and then click Change.
4. Click More Settings, and then click the Advanced tab.
5. Click Add, and then type the mailbox name of the person whose mailbox you want to add to your user profile.

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