Private equite firm TA Associates announced this morning that it has signed a definitive agreement for a majority investment of over €60 million in eCircle , a decade-old email marketing service provider headquartered in Munich, Germany. Founded in 1999, eCircle specializes in a range of digital marketing solutions, but it's mostly known for its high-end email marketing software and related services. The company says more than 550 enterprise clients, including Argos, Nintendo and Samsung, are currently using its eC-messenger Web-based email marketing software, and the company has a transmission volume of over 5 billion emails per quarter. eCircle has over 200 employees, spread across offices in Germany, the UK, France and Italy.