Add Second or Secondary Mailbox into Outlook when using Exchange 2013

 In MS Exchange 2013

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These instructions can equally be used to setup the initial mailbox, but it was trying to get a 2nd mailbox into Outlook, that prompted me to follow this process, and hence write the post.


I used to connect to an Exchange 2010 mailserver and have my mailbox + a secondary mailbox displayed in Outlook. Both mailboxes were on the server

In Exchange 2007 and 2010 days, connecting additional mailboxes on the same server simply required that you had them added. See Below

More Settings - Advanced Tab

This is not the case anymore with Exchange 2013.  When I opened up Outlook after migrating the mailboxes onto Exchange 2013, the secondary mailbox was empty. If I tried to re-add it into the above screen, it kept bringing up messages about the exchange server being offline.


  • Close down outlook & Open up the “control panel”

Control Panel

  • Double Click the “Mail (32-Bit) icon”

Mail Setup

  • Click on the “Email Accounts” button

account settings

  • Click on “New” to create a new account in Outlook

Add Account

  • The radio button is against “Email Account” – Click Next

Add Account 2

  • Put the radio button in “Manual Setup or additional server types” – Click Next

Add Account 3

  • The radio button is against “Microsoft Exchange Server or compatible service” – Click Next

Add Account 4

  • You are now in the Add Account window – Start off by going straight into the “More Settings” button

More Settings - Connection Tab

  • You are now in the Microsoft Exchange window – Click the “Connections” tab
  • Place a tick in the “Connect to Microsoft Exchange using HTTP” box, to activate the “Exchange Proxy Settings button – Click this!

Exchange Proxy

  • You are now in the Microsoft Exchange Proxy Settings window – You want ALL boxes checked if you are within the same LAN as your MS Exchange 2013 Server. You need to fill in the details as I have, replacing the server name with yours. Make sure it’s the FQDN of the server. Note the msstd in front of the servername in the second field – Click OK, and OK again to take you back to the “Change Account screen”

Add Account - Check Name

  • Now type in the FQDN of your exchange server as well as the email address of the secondary mailbox you wish to open – Click “Check Name” – The name should resolve now

This behavior is due to the fact that Exchange 2013 wants all Outlook connectivity to it to happen over the Outlook Anywhere protocol. In order that it can find your secondary mailbox, or even your primary for that matter, it needs the correct PROXY settings in it. Now it’s able to talk “Outlook Anywhere” stylee to Exchange. Notice how the server name field changes to a long GUID style email address

  • Click on “Next and then on “Finish”
  • Now Open Outlook

I found that I had 2 links to my secondary mailbox; the original one, that didn’t work and the new one that did

  • If this is the case, right click on the broken one and choose “Remove”

You should now have BOTH exchange 2013 mailboxes visible in Outlook. DONE!

account settings

account settings + Support

  • If you go back into Control Panel, Mail (32-bit), Email Accounts – You’ll see your second mailbox listed as a “non Default Exchange Server Account”

I have found that sometimes when I go back into Outlook the 2nd mailbox doesn’t work.It says “Cannot expand the folder” – Just wait 60 seconds or so and the secondary mailbox has jumps into life – very weird

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