Use PST to MBOX Converter application to convert Outlook 2013 to Thunderbird including emails and attachments. The software is most reliable and trust-worthy tool for you to convert Outlook 2013 to Thunderbird on any Windows OS versions such as Windows 11, 10, 8.1, 8, 7, XP, Vista, etc. The PST to MBOX Converter is easy to use by both home users and business users to convert Outlook 2013 to Thunderbird MBOX format. It supports all Outlook (32-bit and 64-bit) editions to convert Outlook emails to Thunderbird folder with all metadata, formatting and attachments. Bulk conversion of Outlook emails to Thunderbird MBOX format is also possible with the help of PST to MBOX Converter. To get more info about the software you can download its free demo version.