There can be multiple approaches to convert thunderbird to outlook like the manual method which includes exporting thunderbird email data into EML format then import the data to outlook by creating a folder in outlook and then drag and drop that file in outlook to complete the process but not only this method is inaccurate and can lead to data loss but can also be very time consuming and effort taking. Therefore we recommend to use BitRecover Thunderbird to Outlook converter  which avoids all these limitations and also is much faster and simple to use just import your data and click convert to convert your data into Outlook format. The professional tool also customization options like selecting the destination to save the output and 25+ formats to save your data plus, it also supports bulk transfer which means there should be no worries about how large your data is it will convert all the files in one go.