Keep on working without mails and addressbook being always present

Hi!

This is my first post in this list. In Kmail 1, I had my mails and addressbook 
in an ext4 directory that was not available when I started my computer.

Whenever I needed to read the mail, I "mounted" that ext4 directory, launched 
Kmail and everything worked. Some hours later, I could close Kmail and 
"unmount" the ext4 directory and work without Kmail or I could switch off the 
computer, etc. Without problems.

Can this be done in Kmail 2? Whenever I start the computer, someone (Akonadi 
or Nepomuk or whatever) complains about not finding the addressbook and mails. 
When I launch Kmail again, no message is found in any folder of Kmail, like if 
they were deleted.

I've looked in all the Akonadi-Nepomuk-Kmail FAQs and Google, but found no 
answer. Is there a way to keep on working without mails and addressbook being 
always present? 
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