I propose the Sysinspire software if you wish to convert thunderbird to PST file. This software can convert a single or more MBOX file to Outlook in a matter of seconds. It can convert any size of Thunderbird into the required formats. It can convert Thunderbird folders and subfolders to PST files. It includes a free demo version that converts the first 25 items from Thunderbird to PST.
Read More:- MBOX to PST Converter