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Error: "Unable to open summary file..."

If you are receiving the following error:

"Unable to open the summary file for [folder name]. Perhaps there was an error on disk, or the full path is too long," then you could have a corrupted mail index file.

Please go to the Postbox "Help" menu and select "Trouble Shooting..." and then select this option:

_X_ Reset IMAP mail databases and Search Indexes

Then restart Postbox.