In a FC Now post noting that the WSJ marketing dept. bans email on Friday (promoting more personal forms of communication like phone calls), Philip Reichert makes this interesting comment about email:
I experience of email is that people use it as a documentation tool. EG: If you have doubts about a project then you send an email. If you have comments on a document then you send an email. etc etc. Almost all work that gets done is documented in an email.
Email has become the omnipotent-documentation program with the ethos, “If in doubt – email it!”