But, if you want to switch to a different email program like Mozilla Thunderbird or Apple Mail, you'll run into a problem because they use a different file type called MBOX.īoth OST and MBOX are important for their respective email programs, but they're not compatible with each other.
They save your emails so you can see them offline. For example, if you use Microsoft Outlook, you'll know about OST files. Handling email data can be tricky, especially when you're changing email programs.
