Outlook 2013 - Exchange 2013. Cannot Add Additional Mailbox

We have a mixed environment of Outlook clients – 2010 and 2013, though most are on 2013.   We are also going through an Exchange migration from 2010 to 2013.

For some users, we are getting reports of not being able to view additional mailboxes post Exchange migration.  These additional shared or team mailboxes have been added using the following method:

1.      Click the File tab > Account Settings > Account Settings.
2.      Select email address in the account list.
3.      Click Change > More Settings > Advanced tab > Add.
4.      Enter the shared account name and click OK.
5.      Click Apply > OK > Next > Finish.
6.      The shared mailbox will now automatically display in your Folder pane in Outlook

This shows the additional mailbox below the individuals live mailbox.  Now, for some when they have migrated from Exchange 2010 to Exchange 2013, the mailbox header/name shows in the main view but does not unfurl.    This is affecting Outlook 2013 clients only.   Opening in Outlook 2010 still works but most of the PC's are now Outlook 2013.

We have resolved this by adding the mailbox in another route and that is to use the auto account setup (Add Account from Account Settings).  

Question? - Does anyone know if this is a bug or an Exchange Server setup issue.
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Post the output of the below,
Run on Exchange2010:
Get-Command Exsetup.exe | ForEach-Object {$_.FileVersionInfo}

Open in new window

Run on Exchange2013:
Get-ExchangeServer | fl *version*

Open in new window

Jason CrawfordTransport NinjaCommented:
If all you need is to map an Outlook profile for shared mailboxes you should just be able to add FullAccess and the profile will auto-map itself within about an hour.
I will just reword what Jason said. The procedure you are doing was typical for Exchange 2003 and 2007. Even for those versions, you had to give users access through AD Users and Computers.
For Exchange 2010 SP3 and 2013 go to Exchange Management and select the mailbox you would like to share. Right-click and select Manage Full Access Permission and add users you would like to have access to the mailbox. On the client site, you do not need to do anything because shared mailbox will show up in the next sync. If you did the regular procedure with manual adding mailboxes than you might end with the same shared folder showing twice in your outlook profile.

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FreeSpiritF1Author Commented:
Thanks for your input guys.
You should give the points to Jason because his response was quicker than me
Jason CrawfordTransport NinjaCommented:
Thanks anyway, Nick.  It all comes out in the wash, I've been on the other end of this plenty of times.  Take care guys :)
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