Email 'sent' box can't delete
If you want to clean up your 'sent' folder in the Zotero messages center (http://www.zotero.org/message/sent), you can't. Clicking on a message, followed by 'delete this message', followed by 'yes, I'm sure' has no effect.
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fcheslackNoted. This is a side effect of trying to keep the messaging system as simple as possible. I'll think about the best way to solve that.