Nokia E90 - listening to email messages

Hi,

I have a Nokia E90 and have configured some mail accounts on the
system. The first account I configured was using POP3, and I was able
to hold key 1 down to quickly listen to the messages via the Nokia
voice.

The second account, however, is through the Mail for Exchange
application, and whilst the coms etc are working fine with this, I am
unable to listen to messages in the same way - holding key 1 when I
have a new message just brings up the message in the viewer, and there
is no Listen option in the menus.

Has anyone else come across this before? Does RoadSync do this?

Thanks.
Andrew.