Outlook uses Word for performing mail merge functions such as Form Letters,
mailing labels, envelopes, and fax or email merges. For an overview of these
functions take a look here:
http://www.slipstick.com/contacts/printlabel.htm
http://www.outlook-tips.net/howto/mailmerge.htm
http://office.microsoft.com/en-us/assistance/HA011269731033.aspx#preview
http://office.microsoft.com/en-us/assistance/HA010349201033.aspx

If you want to include the Spouse Name in the merge, you must start the
merge from Outlook in order to have access to that field, then construct the
merge document in such a way that it includes that field.