Vista - Inconsistent Usenet quoting behaviour

Hello,
I'm noticing some inconsistencies in quoting behaviour when choosing Reply
to Group with Windows Mail. I believe I've seen some references to this
elsewhere, but can't find a resolution.

For example, I will read a post, where the original poster used the Google
web interface to create and post his message. When I choose Reply to
Group, the original post is properly quoted and all is well.

By this I mean that the previous post will have a marker, the default beingThe poster replies to my reply, again using the Google interface, with
proper quoting appearing for the two previous messages.

But now, I choose Reply to Group again - and the text I'm immediately
replying to is not quoted. Yet I notice that others using Outlook
Express can reply with the quoting intact, and I can reply to them with the
quoting appearing properly.

Restarting Windows Mail does not resolve this.

Anyone have any ideas on this or how to resolve it?

thanks,
Patrick Keenan