Microsoft has agreed to acquire corporate virtualization specialist Kidaro for an undisclosed amount — though we hear it's around $100 million. Kidaro allows corporations to build secure, controlled workspaces for remote users. Its software enables companies to restrict what applications, network resources and data users can access. Virtualization is big business; Kidaro has a great product for corporations. Why doesn't Microsoft just do deals like this instead of spending $44.6 billion on Yahoo? That seems easier.