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Why doesn't activity transfer from one computer to another?

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I work from 3 computers/offices for my job. If I open an email at one location through Thunderbird and then sign in at a different computer, the same email is marked as a new email. Why doesn't the action stay with the account?

I work from 3 computers/offices for my job. If I open an email at one location through Thunderbird and then sign in at a different computer, the same email is marked as a new email. Why doesn't the action stay with the account?

Chosen solution

You need to use IMAP for sync between multiple devices. Sounds like you have POP.

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看不懂英文

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Chosen Solution

You need to use IMAP for sync between multiple devices. Sounds like you have POP.