I have just set up a new email address using a different host (Gmail) but will continue to use Outlook 2011 for Mac as my interface.  I have already set up Outlook for my new Gmail account and can currently see emails coming into both old (non-Gmail) and new accounts.

I would now like to move some of my folders and sub-folders from my old account to my new Gmail account so I can continue to work with them and be able search for specific emails in them.  Outlook 2011 always runs in the cached mode but does this cache remain permanent and is it a single file (.olm?) comprised of emails from both accounts or are there separate caches for each account?  And once I am no longer using my old email account can I perpetually view emails from the last available cache for this account? 

Finally, will I need to import this file to my new account, and how is that done, or can I, in Outlook, simply drag the folders that I wish to continue using from my old email account over to my new one?