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Try one of these articles:

  • Moving Thunderbird Data to a New Computer This article explains how to move Thunderbird data (such as account data and messages) to a new computer.
  • Profiles - Where Thunderbird stores your messages and other user data Thunderbird saves personal information such as messages, passwords and user preferences in a set of files called a "profile".
  • IMAP Synchronization IMAP stands for the Internet Message Access Protocol. It enables a mail client (such as Thunderbird) to access messages stored on a mail server. It is more modern and fully featured than POP (Post Office Protocol), which is the other major protocol for accessing mail messages. Most email providers now support IMAP. To see whether your account uses IMAP or POP, check the Server Settings page in the Account Settings.
  • Installing Thunderbird on Windows This article describes how to install Thunderbird on Windows.
  • Switch from POP to IMAP account This article explains how to switch from a POP to an IMAP account in Thunderbird.
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