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Agree - Maildir is a pretty good format, because it's just RFC822 (5322 these days, but who's counting) files with weird filenames. mbox format isn't too bad either.

Calendar data you can mainly download as .ics files. Addressbook data is somewhat trickier, a directory full of VCARDs is probably the gold standard.

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mbox format is horrible, because if the irreversible "From" quoting it requires. And as an "editable" format (e.g. If you want to delete an email in the middle of it), it is perhaps the least robust possible.

Maildir is ok. Mbox couldn't be retired early enough.

Yep, .vcf is pretty nice, also stores the contact image inside.

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