Allenwanda137
New member
I have a very large OST file from my old Outlook account that I need to convert into MBOX format so I can access the emails in Thunderbird. The OST file size is quite big, so I am concerned about data loss, corruption, or incomplete conversion if I try manual methods. Can anyone suggest a reliable way (manual or using a tool) to convert large OST files into MBOX format safely? Also, if there are any limitations or precautions I should be aware of during the conversion, please let me know.