A bank in Europe, it was EU wide laws that resulted in all mobile phones being brought into the surveilence net. It has been common in banks to use recorded lines for decades, but the regulatons effectively mandated monitoring of every communication internally and externally post the libor scandal.

That said, when I have worked outside the region or in less regulated positions - the intrusion into particularly email and written communications is the exact same. When you leave an organisation in particular, you do reflect on how big a trail of information you have left behind in their hands.