Reply All from Shared Mailbox removes Sender Address and Duplicates Shared Mailbox Address

Question

Our scenario is as follows:&nbsp;Our client is on Exchange Online and using Outlook 2013.&nbsp;We have 2 people accessing a shared mailbox called Info@mycompany.comPersonA and PersonB have access to the shared mailbox with full permissions. PersonA and PersonB are able&nbsp;to successfully send and receive from info@mycompany.com&nbsp;Test ScenarioSend mail from PersonA@mycompany.com TO info@mycompany.com, random@random.com&nbsp;Test Resultinfo@mycompany.com&nbsp;and random@random.com receive the email - no problem yet&nbsp;Test ScenarioPersonA views the email in the Info shared mailbox and hits Reply All&nbsp;Test ResultProblem exists here where:&nbsp;&nbsp; &nbsp; &nbsp;From = Info@mycompany.com&nbsp; &nbsp; &nbsp;To = Info@mycompany.com, random@random.comExpected behavior:&nbsp;&nbsp; &nbsp; &nbsp;From = info@mycompany.com&nbsp; &nbsp; &nbsp;To = PersonA@mycompany.com, random@randomcom&nbsp;Why would Outlook incorrectly remove PersonA@mycompany.com and incorrectly add info@mycompany.com to the TO field (unecessary since you're replying from info@mycompany.com, the shared mailbox)?&nbsp;&nbsp;How do I configure Outlook to fix this?&nbsp;

vasilmichev · Answer

Most likely becaus Outlook "sees" you as PersonA. So how exactly are you accessing the shared mailbox? This is the expecte behavior when you have the shared mailbox added as additional mailbox (via File -> Account settings -> More -> Advanced), as you are acting as the delegate. If you want the "correct" behavior, add it as additional account instead (File -> Add account -> enter shared mailbox address -> enter *your* username and password when prompted for credentials).

jacques van der hoven · Answer

We're giving PersonA full permissions on that Shared Mailbox, which in Outlook means we don't add the mailbox at all, Outlook does it by itself.&nbsp;

vasilmichev · Answer

So Automapping, got it. This is equivalent to the "additional mailbox" scenario, thus the behavior you are seeing. If you want the "correct" behavior, you need to add it as additional account instead.

jacques van der hoven · Answer

From what you're saying it sounds like Automapping is optional? How do I switch it off and try what you're suggesting?&nbsp;

vasilmichev · Answer

It's optional, but need to be configured via PowerShell. Remove the permissions and re-add them with Automapping turned off:&nbsp;Remove-MailboxPermission mailbox -User delegate -AccessRights FullAccessAdd-MailboxPermission mailbox -User delegate -AccessRights FullAccess -Automapping $false&nbsp;The mailbox will not automatically appear in Outlook then. To add it (as additional account), use the File menu -&gt; Add Account -&gt; Enter the shared mailbox email address and dont enter password. When prompted for credentials, enter the UPN/password of the delegate user.

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Reply All from Shared Mailbox removes Sender Address and Duplicates Shared Mailbox Address

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