Xobni for Outlook, an inbox plugin offering social intelligence and relationship management inside email messages, is opening an app store to users and developers.

The release of the Xobni Gadget Store is part of a larger push by the startup to recruit third-party developers to build applications for their email platform. The Xobni Gadget Platform is based on the OpenSocial Platform and is also accessible to enterprises that wish to create sidebar or message body applications for internal deployment.

Developers can now begin building applications that run inside of Outlook without having to build an entire Outlook plugin. Xobni gadgets are based on the OpenSocial Platform, and enable developers to build sender and message specific email gadgets.