I'm a tester in the Exchange Core team, have been in Interop for the past 3 years. As its obvious from our team name, I test messaging interoperability using Outlook, OWA, OE and OMA clients to test Exchange. I also test POP/HTTP/IMAP/MAPI protocols using clients. Done lots of automation for OWA, Outlook, OE(POP) clients using Exchange. I have some experience configuring Exchange topologies.