Microsoft is set to buy Israeli cyber security company Secure Islands for $100-150 million, sources inform "Globes." The acquisition will be Microsoft's fifth Israeli acquisition this past year and its third acquisition of an Israeli cyber security company over that period. Only three months ago, Microsoft bought Israeli company Adallom for $320 million.Secure Islands was founded in 2006 by brothers Aki and Yuval Eldar. The company has developed technology that allows tracking an organization's documents throughout the web.According to IVC's databank Secure Islands started out in the Chief Scientist funded Xenia Venture Capital Ltd. Van Leer incubator in Jerusalem, and has raised $20 million to date. Its last financing round was in September 2014 when the company raised $12 million from Credit Suisse NEXT Investors LLC.Secure Islands protects unstructured data throughout its lifecycle - from content creation through collaboration to storage. Unlike traditional solutions that deal mainly with the enterprise’s perimeter, and focus only on its entry and exit points, Secure Island’s flagship product, IQProtector, offers a new paradigm. Preforming data immunization on each and every file, it provides full protection for sensitive data whether it is at rest, in motion or in use - on the organization’s premises, on mobile devices or in the cloud. With Secure Islands’ technology, CISOs and IT professionals make sure that organizational security policies are enforced, while making the data fully accessible to authorized users, regardless of where it resides.Secure Islands declined to comment on the report.In the last year alone, Microsoft has snapped up four Israeli companies, like cyber security company Aorato and text analysis company Equivio - each for close to $200 million, and Adallom as well as digital pen developer N-trig.