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Overview Conversation is a messaging application that allows you to follow your conversations, organized by individual contacts. In addition, the application procides and easy way for replying to messagees, and to continue the conversations.
I took a look at BetaLabs and if you open conversation app page, it lists E65 as a compatible phone under the download page. It is not stated in the compatibility "check" in the main page, but here it is listed in 2.c. http://www.nokia.com/A4568203