Go for Maildir to PST Converter, if you want to import Thunderbird Maildir format to Outlook. It supports conversion of multiple Maildir files to PST format in a single round. And there is no need to install the application like Thunderbird or any other application to export Thunderbird Maildir format to Outlook while using this tool. Do not skip the opportunity of a free demo, through which the migration of 25 Thunderbird Maildir format to Outlook is feasible free of cost.