Gloria
New Member
- OS Version(s)
- Windows
- Outlook version
- Outlook 2019 64-bit
- Email Account
- Outlook.com (as MS Exchange)
Operating system:: Mac. Windows
Outlook version: Outlook New 2021
Email type or host: I used multiple IMAP accounts
Outlook version: Outlook New 2021
Email type or host: I used multiple IMAP accounts
After migrating from Mozilla Thunderbird to Microsoft Outlook (Classic Outlook), I noticed that some emails and contacts were missing even though the account configuration was completed successfully. At first, this created confusion, as the mailbox appeared incomplete.
Later, it became clear that Thunderbird stores a significant amount of data locally, including local folders, archived emails, and address books, which are not part of the email account itself. Outlook, however, only syncs data that exists on the mail server and does not automatically detect Thunderbird’s locally stored MBOX files or contact data.
To migrate the remaining local data—such as Thunderbird local folders and contacts I used a paid third-party Thunderbird migration tool (BitRecover Thunderbird Migrator). The tool helped convert locally stored MBOX files and address books into Outlook-compatible formats, ensuring that all emails, folders, and contacts became accessible in Outlook.
This experience highlights that a complete Thunderbird to Outlook migration requires handling both server-based data and locally stored Thunderbird data separately.
Later, it became clear that Thunderbird stores a significant amount of data locally, including local folders, archived emails, and address books, which are not part of the email account itself. Outlook, however, only syncs data that exists on the mail server and does not automatically detect Thunderbird’s locally stored MBOX files or contact data.
To migrate the remaining local data—such as Thunderbird local folders and contacts I used a paid third-party Thunderbird migration tool (BitRecover Thunderbird Migrator). The tool helped convert locally stored MBOX files and address books into Outlook-compatible formats, ensuring that all emails, folders, and contacts became accessible in Outlook.
This experience highlights that a complete Thunderbird to Outlook migration requires handling both server-based data and locally stored Thunderbird data separately.
