Actually got Mail7.2 working OK with Exhange... ie Sent email registering in Sent Folder
I needed to do the folowing: (force a re-registration in Mail7.2 of the Outgoing Mail Server)
Mail>Preferences>Accounts
> Change Outgoing Mail Server and note the original server setting (most probably set from the Exchange Server).
> From the pull-down menu select "Edit SMTP Server List..."
> Select another SMTP Server and click OK. Then close Mail Preferences
> Mail asks you to confirm update. Confirm it
> Go back into Mail> Preferences and select the original server setting and close Mail Preferences
> Mail asks you to confirm update, Confirm it.
Mail should all work OK. I have sent emails with more than 10Mb attachments. Everything is registered as it should be in the Sent Folder.