Using Outlook 2010.

I have a laptop and a desktop that until recently, have been accessing email from the same email addresses.

Due to the inefficiencies of each PC duplicating incoming messages, and not seeing sent messages, I have now purchased a NAS drive to run off my home network.

I am trying to merge, and save the outlook files for the 3 email addresses, to the NAS drive, and have each PC point to these files (Drive Z) but am getting confused.

In the Outlook Account settings, there are folder locations,(under e-mail menu option) then data file locations (under data file menu). All the email accounts are set up, all the date files exist. However when I try to change the folder locations, for 2 of my email accounts, I can see the sub-folders, but not the 'Inbox' folder. As a result, I can't change Outlook to direct mail to these accounts - it will only allow me to select the inbox of one of my 'accounts'. Can anybody direct me to the solution?