Exclaimer, a software company, agreed to acquire Periodic, a software developer. Financial terms were not disclosed. "This acquisition will allow our customers to further optimize the revenue opportunities available in their email signatures by driving booked meetings from every email they send. Exclaimer is driving a fundamental shift in what's possible to embed in personalized emails today. The acquisition is also exciting as it will further drive Exclaimer's strong expansion in the U.S. market," Marco Costa, Exclaimer CEO.