On my Nexus 4, if I enter the wrong password, I get a message "You have unsuccessfully ... 1 out of 4 tries .... " or something like that, and basically says "user data will be lost" if there after that many unsuccessful attempts. When I opted to configure the e-mail with my company's Exchange e-mail/calendar system, I was required to set PIN and agree to other things, but not sure any third-party software was installed, so assumed this was a built-in feature that was merely configured.
