Question about Outlook Express

Hi,

I have an email group for my bookclub from which I have deleted 3 email addresses and this was working correctly.  Recently, however, if I email using this group address (it's called "4-bookclub") it is finding the old list of email addresses  and sending it to those, including the 3 email addresses which are no longer in the group.  Note that if I expand the group in the To box by clicking the + next to its name, the correct address list appears, it's only if I send the email with just the group name in the To box, unexpanded, that this problem occurs.

Why is Hotmail using the old version of the group, not the current one?

Thanks,

Saritha