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Merge Thunderbird Profiles

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On 9 Dec 2020 my Windows 10 computer crashed and as it was still under warranty a serviceman came and replaced my internal hard drive. Therefor I lost everything. I reinstalled Thunderbird on 21 Dec 2020 and got two Thunderbird profiles, one called default-release (now of 1.6 GB) and one called default (of 47 bytes). However, on 30 Sep 2020, I had backed-up the whole of my C-drive onto an external hard drive. The Thunderbird profiles on that hard drive are: .default (of 13.5 GB) .default-release (of 34.7 MB) .default (of 47bytes) .default (of 47 bytes) .default-release (of 10.1 GB) all created on 30 Sep 2020 when I backed up. (The 10.1 GB profile was from a previous hard drive crash and its contents are now part of the 13.5 GB profile.) I presume that the 13.5 GB profile contains all my emails as of 30 Sep 2020. I was thinking that it might be possible to combine my post-20 Dec 2020 emails with my pre-30 Sep 2020 emails. But on searching the web as to how to do this, the general advice is "don't try this, it's not worth the risk, you could lose everything." I also have a twelve year old laptop with one of my Thunderbird mailboxes on it. To practice, I tried pasting the 13.5 GB profile into its Profiles folder but it seemed to be downloading forever. Do those 47 byte profiles have a significance and are they an essential part of downloading your emails? I'd like to persevere with trying to combine emails on the old laptop as I'm an old bloke and not highly computer literate and don't want to risk it on my main computer. Can anyone advise? Thank you,

      Clynt (in Sydney, Australia)

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