Google wants to lock you into their advertising channels (gmail, google docs, google search). As long as your mail app is a source of revenue for someone (whet

Google wants to lock you into their advertising channels (gmail, google docs, google search). As long as your mail app is a source of revenue for someone (whether from support contracts or ads), they benefit from you being locked in, at least locally. Globally they may suffer because of the loss of goodwill, of course.