Reply to all includes sender address

[stuartg.orion]

Possibly related to issues people seem to be having else where with Personas: we're stilling having issues with Outlook including the sender's address when doing a reply to all. I've tried creating Personas for the username and alias in case that is the problem but that doesn't help.

We are using AD usernames as our account names (to simplify login) but the canonical address is set to the alias address of first.lastname@domain. Could this be confusing Outlook? Stuff I've found on Google suggests this happens when Outlook doesn't know it's own address.

This is with ZCO 5.0.6 and Outlook 2007.

Any suggestions?