Plesk Migration fails: Failed to select folder <path> with IMAP. Mail message flags could be restored incorrectly for that folder

Symptoms

• Plesk Migration reports an error related to MailEnable Mail flags from a folder, e.g. Deleted Items:

  CONFIG_TEXT: Error when restoring mail messages of mailbox 'user@example.com' on the target server.
  Command (mail backup was provided to standard input): "C:\Program Files (x86)\Plesk\admin\plib\modules\panel-migrator\backend\lib\python\parallels\core\extras\mail-migrator\windows\MailMigrator.exe" restore --account-description-file="C:\Program Files (x86)\Plesk\var\modules\panel-migrator\sessions\20190719112713\target-server\mail\example.com\user\mailbox-description"
  Exit code: 0
  Stderr: Failed to select folder 'C:\Program Files (x86)\Mail Enable\POSTOFFICES\example.com\MAILROOT\user\Deleted Items' with IMAP. Mail message flags could be restored incorrectly for that folder. Reason: C:\Program Files (x86)\Mail Enable\POSTOFFICES\example.com\MAILROOT\user\Deleted Items

• Emails are migrated but all the emails are marked either as Unread or Read.

Cause

This issue has been identified with the bugs IDs PMT-4632, PMT-4633 and PMT-4744 which are planned to be fixed in upcoming Plesk updates.

Resolution

Reapply the Read flag in the destination server:

1. Log in to the Mail Account on the destination server.

2. Mark the Emails as Read or Unread as needed.