So, what encourages users to undertake them and is there any simple way to export Thunderbird Contacts to Outlook without any loss? Well, this query can be answered as you move further with this blog. Even when there is involvement of two popular email clients like Mozilla Thunderbird and Outlook. But we cannot deny the fact that email migrations are quite tedious and challenging to complete. The popularity of Microsoft Outlook is growing exponentially day by day, a lot of users have exported their existing email accounts to Outlook. How to Export Thunderbird Address Book to Outlook PST Format?