This blog post will show you how to configure a Shared Mailbox sent Items behavior.
By default what a user send an email from a sharemailbox that is linked to his mailbox the sent email will appear In the sender sent Items folder and not In the Shared mailbox sent Items Folder.
With Exchange Server we can control this behaviour from the server using Exchange cmdlet or from OWA.
I’ll show both option
For Exchange 2010 use the cmdlet:
Set-MailboxSentItemsConfiguration SHAREDMAILBOX-SendAsItemsCopiedTo:SenderAndFrom -SendOnBehalfOfItemsCopiedTo:SenderAndFrom
For Exchange 2013 and 2016 Sent Items Sent As use:
set-mailbox user03 -MessageCopyForSentAsEnabled $true
For Exchange 2013 and 2016 Sent Items On Behelf Use:
set-mailbox user03 -MessageCopyForSendOnBehalfEnabled $true
On Exchange 2010 only you can use OWA:
Open OWA – > Options -> See All Options -> Settings -> Sent Items
This option is only available on Exchange Server 2010 SP3 +, Exchange 2013 CU9 + and Exchange 2016
For Versions older then the above use: