Thekkath began his career at Microsoft as a Senior Researcher at Microsoft Research Silicon Valley, where he did research in multiple areas: mobile devices, distributed data intensive computing, and large-scale storage systems. He also worked with the Hotmail team as chief architect for the Blue project. Blue went into production use within MSN in mid-2006 and was an early example within Microsoft of a large scale distributed storage system that provided strict read/write guarantees in the presence of disk, machine, and network failures.