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Transferring from Mac to PC. I manually moved Profile, got all my emails. But not Calendar. I've exported from it, got an .HTML file(??) Stymied now. Help!

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I'm moving from Mac to PC. (Tip for young players: don't do this for fun). Have Thunderbird on both. I've successfully got my emails - by following the 'Manually moving files' instructions in https://support.mozilla.org/en-US/kb/moving-thunderbird-data-to-a-new-computer. However, it didn't move my Calendar data. I'm guessing that's coz Lightning is an Add-On. I tried exporting Calendar data on the Mac - produced an HTML file, (which surprised me, but hey what do I know?). My idea was to copy it to a USB, plug that into the PC, then Import it. However, there doesn't seem to be an Import function to do this (?).

Can anybody tell me what I need to do to get my Calendar data over from the Mac to the PC please?

I'm moving from Mac to PC. (Tip for young players: don't do this for fun). Have Thunderbird on both. I've successfully got my emails - by following the 'Manually moving files' instructions in https://support.mozilla.org/en-US/kb/moving-thunderbird-data-to-a-new-computer. However, it didn't move my Calendar data. I'm guessing that's coz Lightning is an Add-On. I tried exporting Calendar data on the Mac - produced an HTML file, (which surprised me, but hey what do I know?). My idea was to copy it to a USB, plug that into the PC, then Import it. However, there doesn't seem to be an Import function to do this (?). Can anybody tell me what I need to do to get my Calendar data over from the Mac to the PC please?

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One thing - I've realised why it's HTML - sorry! That's what I saved it as (dur...). I can also save it as .ics & .csv, so I've created those too