I use IMAP email connections with the Entourage X app, and I have many folders created on the IMAP server. Occasionally, I would get the error message "Mail could not be receive at this time: An error has occurred (-50)" whenever refreshing the message list of a specific folder.
As it turns out, many IMAP servers and/or Entourage itself do not like periods or colons in the folder names. As soon as I took out the colon and period from a couple of IMAP folders, everything was sublime and my message list zipped about my screen.
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