Bharat joined Microsoft at a mysterious date between the end of March and beginning of April 2008. He is a Senior Technical Writer in the Exchange User Education team, responsible for content related to Messaging Compliance, Security, and Transport.
Before joining Microsoft, he worked as Principal Exchange Architect. He has held various positions at half a dozen startups before that— doing mostly Exchange, Windows platform and security-related stuff.
Bharat is a former Exchange MVP, current MCT, MCSE (+Messaging +Security), MCITP.
He is the coauthor of Exchange Server 2007: The Complete Reference (Osborne McGraw-Hill), and publishes Exchangepedia blog.
You can often find him in Exchange forums and newsgroups (microsoft.public.exchange.* @ news.microsoft.com).