It's kind of hard to understand what you mean without a little more detail, but I read it as you want to create an email archive. One way would be to create an extra account that you just move all the old emails to: the files will still be stored in the current profile though.
What it kind of sounds like you are asking though is how to create an email archive profile. You could start thunderbird using
Quote:
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thunderbird --ProfileManager
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and create a new archive profile directing to the old folder there.
