re: At this time I am sharing this computer with one other person .

Usually, when people share a computer, each user has their own User Account which they logon using a password. This means that Thunderbird then runs in that User Account and creates a profile in that User Account which holds all the Profile data, emails, passwords, address books etc specifically for that users email address mail accounts. So then no one can read each others emails nor access other peoples passwords and they can use their own address books.

So if you are sharing a computer and sharing a Profile, then it is advisable that you do not have any stored / remembered passwords, unless that person is eg: spouse and you do not mind them having full access to all your personal stuff.

You have a couple of Options: 1. Create User Accounts on your computer so that each user has their own User Account, Create a Thunderbird Profile folder and set up mail accounts storing personal emails and address books. This is the only method offering best security.

2. Create another Profile for the other person. then create mail account for that Profile. This will then have it's own folders, address book. Use Profile Manager to create another Profile. http://kb.mozillazine.org/Profile_Manager Make sure to uncheck the box 'Don't ask at startup' to force it to ask which Profile to use. Any user can still access any profile.

3. In current situation. Stop auto saving outgoing email addresses that are not in the address books as this uses only one setting per Profile. Tools > Options > Composition > Addressing tab uncheck: 'Automatically add outgoing email addresses to my' click on OK

Then you would need to use an Addon in order to be able to select a specific address book when you wish to add the email address/contact to an address book. At the moment, if you click on the FROM header email address or right click and select 'Add to address book', this adds to the default address book called 'Personal Address Book'. This you cannot change because you are using the same User account and Profile.

But with the addon 'MorefunctionforAddressBook' Right click on eg: From header and choose > Save recipients addresses' > as Contacts This allows you to select the address book you require.

Addon 'MorefunctionforAddressBook':

• https://nic-nac-project.org/~kaosmos/morecols-en.html

Download to desktop. In Thunderbird: Tools > Addons Clickon on gear wheel icon and select : Install addon from file; locate file you downloaded and click on Open You may need to restart Thunderbird.

No, because Thunderbird has no concept of different users. It assumes that the user "owns" everything.

Two ways forward I can suggest:

1) You set up two profiles, one for you, one for the other user. Each will have their own separate message store, adress book etc. All you have to do is learn how to create and select multiple profiles, and remember to do it at each start up. Batch or lnk files on your desktop or menu could be set up to help.

2) The much better way is to each have your own User Account (set up in the Operating System) so you login in to the computer as you and you see only your files. This way, each User gets their own profile.

In both cases, selected mailstores could be made common and thus shared between you.

I am not sure how addresses are automatically getting into your Address Books. You generally have to do something specific to add a new Contact. Do you write a lot of messages to new addressees who you haven't written to before? They would be automatically added to the Collected Addresses address book, but this feature can be turned off, usually under "Options".