[Bug 1946606] Re: thunderbird 91 does not support movemail

[Nathaniel Beaver]

I think this would be well worth mentioning in the changelog.

Just to give one reason: the changes to the profile folder from the 78.x
to 91.x series are irreversible. Once a profile has been opened with the
91.x series, even after re-opening with 78.x and --allow-downgrade the
local mail account is unreadable. As best I can tell, the mail isn't
actually deleted, it's just invisible to the profile configuration, but
you can't get it back without potentially corrupting the entire profile.
Moreover, at some point in the 78.x series setting up a new movemail
account became impossible, so the most expedient recovery method is
unavailable.

This means users with a Thunderbird movemail account will permanently
lose access to that account unless they have a full profile backup to
restore from. I think most folks would agree this counts as a regression
that has the potential to result in data loss.

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Title:
  thunderbird 91 does not support movemail

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