Sorry for the crosspost... I thought this group might also have some ideas as
to what my problem is:

The scenario is as follows:

I have Office 2000 running on nearly all of the machines in my office. We
recently moved to Exchange Server 2003 which came with Outlook 2003. We ran
the Outlook 2003 install and chose to “upgrade,” which said it would first
uninstall outlook 2000. On new machines I have been installing Office 2000
without Outlook 2000, and then installing Outlook 2003 afterwards. The
results of both installation scenarios have been giving us some peculiar
errors when trying to use the “send to mail recipient” options from in widows
and from within the office 2000 applications.

In Word, I try the File>Send To> Mail Recipient and get the following error:
Word Could Not Load The Mail Envelope. This could be cause by a network
connection problem or a problem with your Office installation.

Another problem is that some computer users try to right-click on a file and
select Send To > Mail Recipient. They get a message saying: Either there is
no default mail client or the current mail client cannot fulfill the
messaging request. Please run Microsoft Office Outlook and set it as the
default mail client.
(I have tried this, but it does not resolve the problem)

One other error I have seen that is related to this issue is: Word couldn’t
send mail because of MAPI failure: “Unspecified Error”.

ANY help resolving this issue would be incredibly appreciated. I have around
10 users that frequently use the send to mail recipient features, and they
have to manually attach files now.

Thanks in advance!