LinkedIn has acquired contact management service Connected, it has been confirmed. As a result of the acquisition, Connected has made its service free to all users. Financial terms of the deal have not been disclosed.

Connected launched in February with the aim of helping professionals build, maintain and leverage their professional networks. Users are managing more than 11 million contacts through Connected’s automated real-time address book and a system that encourages them to keep in touch with their contacts. Connected has integrations with several social networks (including Facebook, Twitter and, of course, LinkedIn) and has several features, including daily agenda emails.

The service lets you see all of your contacts’ most recent social activity and brings all of your conversations with them together in a single location. Connected automatically updates your contacts’ information, such as their latest company, title or location.

As part of the acquisition, Sachin and Ada Chen Rekhi, the husband and wife team behind Connected, will be joining LinkedIn (which has more than 120 million users, up from the 115.8 million it had at the end of June) and will work on improving contact management at the social network. Connected closed a $500,000 seed funding round in June, with Ignition Partners and Trinity Ventures among the investors.