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I have this problem too...when I want to compose an email I get the message 'A problem hbas occurred while trying to open this message. A problem has occurred. Please try again' I do not receive any error code.. I have not tried to send an email using the web. The same thing happens when I try to reply to an email. The version I am using is 2011, POP configuration.
Any help to resolve this would be much appreciated. Thank you very much