Thanks for your reply.
The microsites are intended accentuate the 4 top selling services we offer. Of course these services are listed and marketed on the main site.
The microsites each have a different domain name, with the name closely associated with the service being offered.
The adwords campaigns are running off the main site, again each focused on these four main service areas. We have, however set up separate landing pages for each campaign, one of which uses the same domain name as the main site, but a .net extension vs. .com.
As you see, we have a well intentioned hodge podge going on here. Your expertise is appreciated.