I have a Vista workstation in a SBS 2008 domain. When this user sends emails with attachments using Outlook, they are send as a winmail.dat file. That is fine if the recipient is using Outlook, but these attachments cannot be opened on computers which do not use Outlook or an Outlook compatible reader. This only started happening recently with our conversion from SBS 2003 t0 SBS 2008, so I think something in this user's profile may have been changed. Before, this user on this same Vista workstation could send normal, mime encoded attachments that could be opened by non-Outlook mail readers.
Is there some setting in this user's Outlook, or in Exchange that I can set to fix this problem? I've looked around and nothing jumps out at me.