Windsor Circle, which sells customer retention and online marketing technology, has raised $5.25 million.

Comcast Ventures led the Series B funding round, which also included IDEA Fund Partners, Triangle Partners and AOL founder Steve Case, who put in $100,000. Windsor says it will use the capital to “extend its retention automation technology, expand into new channels and verticals and meet increasing customer demand by expanding both team and marketing efforts.”

Windsor’s products help retailers to connect their e-commerce platforms with e-mail marketing efforts and analytics programs. That helps web merchants better identify their best customers, the company says. Among the 200 or so retailers that employ Windsor is men’s clothing merchant Onward Reserve, which operates two stores in Georgia along with OnwardReserve.com. Other Windsor clients include Bonobos, No. 282 in the 2014 Internet Retailer Top 500, and Artbeads.com (No. 488). Windsor provides e-mail marketing or personalization technology to 11 retailers in Internet Retailer’s Top 500 and Second 500 Guides.

“Marketing technology is changing very rapidly as new data sets become available to [chief marketing officers]. Windsor Circle is bringing enterprise-quality technology to the market that is push-button simple to use,” says Andrew Cleland, managing partner at Comcast Ventures and a new Windsor Circle board member. “Based on its rapid growth, solid team and strong client ROI, we are excited to be investing in this company.”