Mail.app folders not sorting alphabetically

I managed to accidentally change the order of my folders for an Exchange Server in Mail.app and found it impossible to get them to return to alphabetical order by dragging folders around. I found the following solution on Apple Forums

https://discussions.apple.com/message/11157240#11157240

Basically you need to delete/rename (depending on your back strategy or paranoia level) .mboxCache.plist for the relevant account whilst Mail is not running then start it up again.

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