Mail merge looks for addresses in Outlook instead of data source

I am unable to do mail merges for the last few weeks.
Since I've downloaded all the "Security" updates from
Microsoft. I set up a simple mail merge to email and
select the data source. When I try to send the emails,
Word looks in my Outlook address book for the email
addresses and if the first name matches the email address
in the data source it sends the message to that email
address not the one in the data source. Does anyone have
a solution for this problem? The only solution we have
found here is to go back to Office 2000 which seems like
a stupid solution.

Help!