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I have Apple Calendar export as .icbu file. Can you help me import to Thunderbird 115.18.0?

Thunderbird Calendar
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Used Outlook Mac 2011 for years. It crashed and could not retrieve from Time Machine. Lost everything since 2021. Apple was able to restore my calendar in Calendar app but I'd like to have integrated app and am trying Thunderbird for email. I would love to use it's calendar and contacts. I am nearly 90 and it's hard to learn new tricks but I'm trying. Any help appreciated. Thanks.

Used Outlook Mac 2011 for years. It crashed and could not retrieve from Time Machine. Lost everything since 2021. Apple was able to restore my calendar in Calendar app but I'd like to have integrated app and am trying Thunderbird for email. I would love to use it's calendar and contacts. I am nearly 90 and it's hard to learn new tricks but I'm trying. Any help appreciated. Thanks.

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