Microsoft has bought Israel-based cybersecurity startup Adallom to advance identity and security in the cloud. The deal size remains undisclosed however TechCrunch estimates it to be around $250 million. Co-founded in 2012 by Assaf Rappaport, Ami Luttwak and Roy Reznik, Adallom works with popular cloud applications including Salesforce, Box, Dropbox, ServiceNow, Ariba, and Office 365.