Hi Andrew, sorry to hijack the thread. Just wanted to say you guys are doing an amazing job at full-text email searching. Do you have any paper on that? I know

Hi Andrew, sorry to hijack the thread. Just wanted to say you guys are doing an amazing job at full-text email searching. Do you have any paper on that? I know Google publishes research papers and technical reports but couldn't find one about that. Any pointer would be much appreciated. Thanks!