If you want to convert your Thunderbird to Outlook 365 then you will go with this informative article which is Migrate From Thunderbird To Outlook 365. This article will provide the most effective and efficient manual solution to migrate the process. However, the manual solution has too technical for non-technical users. Therfore, they will also introduce an advanced solution Thunderbird Backup Tool. The software is a full-fledged utility that saves your Thunderbird mailbox to different file formats and several email clients. Moreover, it allows you to preview your Thunderbird mailbox and the items present in it before migration. You can split your large resultant PST files into small parts through the split resultant PST feature. Additionally, it supports all versions of the Windows operating system. To explore the performance you can download it.