Password protect mail

i am using W10: can someone tell me how to password protect Thunderbird or Live Mail? or to make Mail require a password on startup?
It is annoying, for example when I bring my PC to repair, that they can read my mails. Thanks.

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Thanks itsdigger

so, after creating a container with Vera Crypt (it replaced TrueCrypt), have I to move in it these three elements found in the Thunderbird folder?
But every time I have to put them back in the Thunderbird folder, otherwise Thunderbird does not find them. The mails are in the Profiles folder.
The encrypted container is the "mail" file.
Do you know how to configure Thunderbird for the new location?

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No, I'm still a semi noob at this

sort of thing so, I'll wait for a Pro to step in

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Live mail = no.

The usual path is to move to whole drive encryption and password our logins. There are some that play with folder and such locks but I find those folk lose it all or expect support for free apps.

No repair shop I know has interest in emails a person has. They have to get it fixed and move to the next PC.

Maybe Portable Thunderbird is the answer so you can run it on a memory stick.

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