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If you are looking to transfer Thunderbird to Outlook 365 then you will go with this informative article Migrate From Thunderbird To Outlook 365.  This article will provide the most effective and secure manual method to migrate the process. However, the manual method is a too lengthy process. Therefore, additionally, they will also provide the professional solution Thunderbird Backup Tool. The software is a full-fledged utility that saves your Thunderbird mailbox to PST, PDF, EML, EMLX, MSG, CSV, etc. It also safely migrate MBoX files or folder to several email clients like Gmail, Yahoo Mail, Hotmail, Office 365, IMAP, etc. You can split your large resultant PST file into small parts through the Split Resultant PST feature. Additionally, it supports all versions of the Windows operating system. You can try the trial versions of the software to analyze the performance.