do people rely too much on email?

on fridays, i only work in the evenings. my "supervisor" who was away all week, sent me an email about a program we are putting together.

he sent it at 11am, and i didnt get online until 4pm and the info he assumed was right, is incorrect.
oy!
why couldnt he just have called me!

i hope the programs havent been finalized w/out my corrections.....