Thunderbird delete account

I am giving my laptop to another staff member.
I store email on it using Thunderbird as a local mail client Imap'd to Gmail. 
So I want to
a) Delete my passwords.
b) Delete all the mail
c) Disconnect the calendar
d) Disconnect the address book.

A) DELETE GOOGLE PASSWORD FROM THUNDERBIRD
reference here
(This applies both to IMAP and POP3:)

For some reason, the password is not configured with the account's server settings (port, server name, user name are all in one place - password is configured elsewhere)
Thunderbird 'caches' your password. What you need to do is tell Thunderbird to 'forget' your (old) password.

1. In the menu, select Tools | Options.
2. Then click on Advanced
3. Move to the Passwords section and click on 'Manage Stored Passwords'
4. Select the site/username line where your password needs to be updated and delete it by clicking Remove.

click Close and then restart Thunderbird.

The next time Thunderbird tries to poll email from this server, it will prompt you for the password and offer to save it.

b) Delete all the mail
c) Disconnect the calendar
d) Disconnect the address book.

B DELETE THE ACCOUNT FROM THUNDERBIRD
reference here
Go to Tools->Account Settings. Select the account you want to delete. At the bottom of the left-hand side of the screen (i.e., the side where the accounts are listed), there's an "Account Actions" drop-down menu. Select "Remove Account". 

 And its all gone.
Probably did not need to do step A.