SysTools Thunderbird Import Wizard for Windows

Name: SysTools Thunderbird Import Wizard
Author: SysTools

By SysTools
Trial version
User Rating

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Editors’ Review

Download.com staffFebruary 24, 2026

This utility imports MBOX, EML, and Maildir files into Mozilla Thunderbird. It supports bulk migration of emails and attachments while preserving original folder structure, with no file size limits.

Top Recommended Alternative

SysTools PST Merge

Trial version

Pros
- Imports MBOX, EML, and Maildir file formats
- Supports bulk import of files and entire folders
- Preserves original folder hierarchy and email formatting
- Includes date range filter for selective email import
- No file size limitation on imported files
Cons
- Lacks support for other formats like PST
- Functions as a standalone app, not a direct plugin
- Migration is one-way only into Thunderbird
- Does not import non-email data like contacts or calendars
- Provides one-time import, not continuous synchronization