There are many tools, but I recommend Yota IMAP Migrator. This utility allows you to import IMAP emails to Thunderbird as well as other formats such as PDF, PST, MBOX, CSV, MSG, etc. It also lets you transfer IMAP data to Gmail, Office 365, iCloud, Outlook, and more. It ensures quick, accurate, and seamless migration while preserving folder hierarchy and data integrity.
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