F5 vs Mimecast

F5 Networks, Inc. is a multinational American company which specializes in Application Delivery Networking technology that optimizes the delivery of network-based applications and the security, performance, availability of servers, data storage devices, and other network resources. F5 is headquartered in Seattle, Washington and has development, manufacturing, and sales/marketing offices worldwide. F5 originally manufactured and sold some of the industry's first load balancing products. In 2010 and 2011, F5 Networks was on Fortune's list of 100 Fastest-Growing Companies worldwide.

Mimecast is a software as a service company specialising in unified email management and Email filtering. Mimecast was founded in 2003 by Peter Bauer and Neil Murray. It is headquartered in London and maintains offices in Cape Town, Johannesburg, Melbourne, Austin, Dallas, Chicago, San Francisco and Boston. In January, 2010, the company raised $21 million in Series B financing from Index Ventures and Dawn Capital.