Change default send items behavior of Auto-mapped Shared Mailboxes

A commonly heart end-user frustration with Auto-mapped shared mailboxes is that Send emails from the shared mailbox end up in the send items of the user it self. In the past you would need to set a registry key on the client computer to get this resolved. But with Office 365, there is an easy way to change this behavior for every user.

PowerShell

With PowerShell this job is done in less than a minute in just 2 simple steps.

STEP 1: First connect to Exchange Online using the following commands:

$UserCredential = Get-Credential

$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $UserCredential -Authentication Basic -AllowRedirection

Import-PSSession $Session 

STEP 2: Now run the following command to set the default behavior for all Shared Mailboxes in your Exchange Online environment.

Get-Mailbox | Where {$_.RecipientTypeDetails -eq “SharedMailbox”} | Foreach-Object {Set-Mailbox -identity $_.Alias -MessageCopyForSentAsEnabled $True }