I need some help figuring out how to share a former employees mailbox with current employees.

Employee A has left the company and employee B needs full access to x-employee A's email.  We're using Exchange Server 2010 and Outlook 2013.  In years past I would just open x-employee A's mailbox in the exchange management console, and in the "mail flow settings" tab under "delivery options" I would add employee B.  Then employee B could add x-employee A's mailbox in outlook and all was well. 

Now for some reason when I do this, employee B can successfully add x-employee A's mailbox to outlook, BUT attempting to expand the mailbox to view the folders gives the error "Cannot expand this folder." 

I'm not an IT guy, I just play one on rare occasion, and in this case I have no idea what I'm missing.  Can anyone help?

I need some help figuring out how to share a former employees mailbox with current employees.

Employee A has left the company and employee B needs full access to x-employee A's email.  We're using Exchange Server 2010 and Outlook 2013.  In years past I would just open x-employee A's mailbox in the exchange management console, and in the "mail flow settings" tab under "delivery options" I would add employee B.  Then employee B could add x-employee A's mailbox in outlook and all was well. 

Now for some reason when I do this, employee B can successfully add x-employee A's mailbox to outlook, BUT attempting to expand the mailbox to view the folders gives the error "Cannot expand this folder." 

I'm not an IT guy, I just play one on rare occasion, and in this case I have no idea what I'm missing.  Can anyone help?

Delivery options isn't the correct procedure. You need to give full mailbox access.

Note that doing so will add the mailbox automatically by default to the users Outlook profile, so have the user remove the shared mailbox from their Outlook as well and let it get added automatically.

https://technet.microsoft.com/en-us/library/aa996343(v=exchg.141).aspx

Thank you very much, that worked great!  I didn't even notice the action pane over there on the right side of the UI, it blends in with the background very well.