I have an iMac with Outlook. When I've updated to macOS Big Sur I've lost al my mails on Outlook (the computer did something strange with iCloud Sync). Fortunately I have an .olm backup file of all my mails (actually the mail account is dead, so I can't reconnet to the mail server in order to download all my mails). I have the latest Outlook version and I've tried to import my .olm file, but Outlook says that is not possible to import that file, without any other info. I need those mails and this file is my only hope. How can I solve this problem? Should I install an older version of Outlook? How? Can I try to convert the .olm file to another format in order to open it with Thunderbird or Apple Mail app?
