Mozilla Thunderbird is an open source, cross platform email application that provides you a boatload of email functionalities, such as message management, junk filtering, extensions and themes, and much more. Mozilla Foundation developed this one open source email client. Thunderbird keeps your messages, contacts, and settings in a folder named 'Profile' that is present at (for Windows):
C:\Documents and Settings\Administrator\Application Data\Thunderbird\Profiles\wspaeqja.default\Mail'
The messages for a particular folder are stored in MBOX files that carry no extension. If you need to change your email program and move all messages to MS Outlook, then the only option for you is to use an advanced Thunderbird to Outlook email conversion tool. Stellar MBOX to PST Converter facilitates a smooth migration from Thunderbird to Outlook by allowing you to effortlessly conversion of Thunderbird files to Outlook PST files.
With joining new office, it wasn't feasible to continue my work on Thunderbird email client. My old emails were still needful for me. Thankfully, I had used this tool for migration from Thunderbird to MS Outlook 2013 and believe me it works!!
EASY TO USE
RELIABLE & SECURE