Cannot expand the folder in Outlook

Error when trying to access additional mailboxHi,
 I have SBS2011/Outlook 2010 and there are two users/mailboxes - UserA and UserB for example.
 UserA wanted to see all the emails of UserB. So I did the following:
(1) I added UserB into Manage Full Access Permission of UserA in Exchange Management Console/Recipient Configuration/Mailbox section.
(2) Opened UserA Outlook 2010 and Account settings/UserA/More Settings button/Advanced Tab/added UserB.
When I opened UserA Outlook, I saw UserB at the bottom, but when I tried to open UserB folder, it gave me the error (see screenshot with error message)
(3) I selected UserB in UserA Outlook, clicked Folder tab, clicked Folder Permissions and added UserA as "Owner" in Permission level, but I still get the same error.

What else can I try?
Who is Participating?
Jason CrawfordConnect With a Mentor Transport NinjaCommented:
Add-MailboxPermission userB -User userA -AccessRights fullaccess
sgleeAuthor Commented:
That did it. I have a question. I have added an mailbox to another mailbox in the past without running Add-MailboxPermissio cmdlet before. Why did it make the difference this time?
Jason CrawfordTransport NinjaCommented:
I'm hesitant to comment based on the info I have so far.  Can you clarify exactly what you mean by 'added a mailbox to another mailbox'?
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sgleeAuthor Commented:
Advanced sectionUserA OutlookSorry about the confision ... UserA and UserB("Archive1") are users in SBS2011 and each user has its own mailbox in exchange.
I wanted to make UserB(("Archive1")  mailbox visible inside of UserA's Outlook.
To explain further, UserA's mailbox exceeds 50GB currently and I can't run UserA's Outlook in Cache mode but want to maintain a local copy of the mailbox (just in case SBS2011/Exchange system crashes). So I created another user called "Archive1" and made Archive1 mailbox visible(available) in the Outlook of UserA so that UserA can move folders to Archive1 mailbox until UserA mailbox size stays below 50GB (and then I can run UserA Outlook in Cache mode).
Jason CrawfordTransport NinjaCommented:
Oh I see what you mean.  That's the method we had to use with Outlook 2007 before Outlook 2010 supported multiple mailboxes in one profile.  You may still be able to employ the method you're using, but the better option is to just add an account to the pre-existing profile or let the profile auto-map.
sgleeAuthor Commented:
"he better option is to just add an account to the pre-existing profile or let the profile auto-map." ---> can you expand on that? Without adding "Archive1" mailbox under UserA mailbox, how would you do it?
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