Can anyone recommend a contact management plug-in OR software application that uses Microsoft Outlook as its primary "engine"? Specifically I want a tool that will help me manage buyer/seller leads, create and auto-send time-specific drip mailers to different groups/individuals, etc.

I've found two different companies that provide an outlook-based product. See:

Sonoma Enterprises (seems expensive and website is fairly non-desript) http://www.sonomaenterprises.com/outlook.htm


Eureka Software (cheap): http://www.eurekaware.com/

Does anyone have experience with either of these products? If you haven't worked with these two products, can you recommend another worth checking out? Again, I want this for contact management and auto-prospecting.