Assignment 1
Search for emails by Subject. 

Assignment 2
Create a new Address Book and add contacts to it. 

Assignment 3
Create a new address book called Additional Office Contacts.
Use the Edit option in the Address Book toolbar
Delete this address book.
From the Main menu in the Address Book dialog box, select Edit and Search Addresses.
Use the Advanced Search option to search for addresses.

Assignment 4
Create a new address book
Add and view contacts
Import contacts from your personal email ID to your Thunderbird account.
Select and match all the fields while importing the address book.