Microsoft is bolstering its cloud storage business, acquiring Santa Clara, California-based appliance maker StorSimple in a deal of undisclosed size.

In a blog post, StorSimple’s Patrick Phonsakkhwa says they “are thrilled about the scale and business agility that we’ll now be able to deliver for our customers and partners.”

In a press release, Michael Park, corporate vice president of Microsoft’s Server and Tools Division, said that customers are turning to the cloud for their storage needs.

“StorSimple’s approach helps customers seamlessly integrate on-premises storage with cloud storage through intelligent automation and management,” Park said. Microsoft and StorSimple inked a deal earlier this year in which StorSimple became a hardware partner for the Microsoft Technology Center alliances program.

Backed by Ignition Partners, Index Ventures, Mayfield Fund and Redpoint Ventures, StorSimple raised $13 million in 2010, bringing total funding to $21 million.

The acquisition comes amid a lot of excitement in the cloud storage arena, including funding for companies such as Box ($125 million) and Symform ($11 million).

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