My mom has been using thunderbird since 2015 like me on a debian based linux distro. I upgraded her PC lately. I double backed her .thunderbird account by copying her .thunderbird folder and using export to an external drive. It took an unusually long time to do this. Her email account is setup to use smtp but she has >1GByte size mapi folder. After getting the new PC up and running, only the smtp email is showing up. How can I access the email in her mapi folder?