default address book
How can I make address book of my gmail account as default?
Secondly if I want to add email address of any downloaded emails or incoming emails then by default they add it to my default address book of my gmail account.
Alla svar (1)
You can't change the default address book, but if you use the Contacts sidebar (F9 in a Write window), you can select which address book appears when the sidebar is visible.
When you click the yellow start next to a sender's address in the Message Header to add it to an address book, the first click stores it in Personal Address Book, but if you click the star again, it's possible to select the address book from the drop-down list.