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This problem occurs on the default mail client, K9, and Touchdown when using zimbra as exchange.
Whenever I receive an HTML formatted message, My phone is displaying all of the html code rather than the properly formatted message - IMAP does not have this issue, only exchange.
I am running an HTC EVO 4G on sprint with a stock setup of Android 2.2 running HTC's Sense UI. We are running version 6 of Zimbra.
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Problems with Android 
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