The BlackBerry Partners Fund, which is an independent investment fund dedicated to investing in software that supports devices made by Research In Motion, has made a $3 million investment into Xobni, a San Francisco-based company that has developed an Outlook plug-in that let's you search your email faster and keep track of conversations and attachments. The name Xobni comes from inbox spelled backwards.

The investment will go towards the company's second round of funding. In early January, it raised $7 million from Cisco Systems (NSDQ: CSCO), Khosla Ventures, First Round Capital, Baseline Ventures and Atomico. In total, it has now raised more than $10 million in the round. The company said on its blog that "the investment will allow us to strengthen our service and extend Xobni to new platforms for our customers. The next stage of development will focus on the launch of our premium service later this summer." The BlackBerry Fund's interest in the company lies in its ability to move the technology to other devices, according to the press release. (Via PEHub.)