Office 365 – Give permission on a mailbox

Michael Cloud, How To Guides, Office 365, TechTalk

You may find it necessary to grant a user /admin the ability to open and view the contents of another users mailbox. Here are a few quick steps to guide you through this process.

Connect to your Exchange Online Powershell and enter the following

[note color=”#CCD6DB”]$Cred = Get-Credential [/note]

Enter your credentials and then enter the following two lines to complete the connection to your Office 365 tenant admin.

[note color=”#CCD6DB”]$s = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri -Credential $cred -Authentication Basic –AllowRedirection [/note]

To assign a single user / admin permission to a single mailbox.

[note color=”#CCD6DB”]Add-MailboxPermission -User -AccessRights FullAccess -InheritanceType All -AutoMapping $false [/note] is the mailbox you want to view. is the person you want to assign permissions to.

If the command was Add-MailboxPermission “” -User “” -AccessRights FullAccess -InheritanceType All then UserB would be able to view all userA’s email.

IMPORTANT – I have included -AutoMapping $false. This means the mailbox will not automatically appear in user who was being assigned permissions mail. If you set this to $true, the mailbox will automatically get added the next time Outlook/Mail is opened.

To remove a single user / admin permission from a single mailbox.

[note color=”#CCD6DB”]Remove-MailboxPermission -User -AccessRights FullAccess -InheritanceType All[/note]

There are a host of options with this available on Microsoft’s site too. –



Michael is a Technology & Digital Consultant to the Real Estate, Property, Travel and Tourism industies with over 13 Years of leading Technical teams & Programme Management. He has worked with agencies in multiple countries and cities from the UK, New York, Russia, France, Dubai to Australia and South Africa. In his spare time he is a commercial drone pilot that dabbles with Photography & Videography.

Facebook Twitter LinkedIn Google+ Skype