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    How to Grant Full Access to an Office 365 Mailbox

    To Grant full Access to a Mailbox in Office 365 you must first connect to the remote PowerShell, by typing the 3 commands in your local PowerShell:

    $o365cred=get-credential
    $Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell/ -Credential $o365cred -Authentication Basic -AllowRedirection
    Import-PSSession $session

    After you are connected, you must run the following command to give Alan full access to Bob’s mailbox:

    Add-MailboxPermission -identity Bob@domain.com -user Alan@domain.com -AccessRights FullAccess

    If you wanted to give Alan full access to all mailboxes in your environment you would run:

    Get-Mailbox | Add-mailboxpermission -user Alan@domain.com -AccessRights FullAccess

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