Show sum value of range in msgbox

[TimmerSuds]

I would like to be able to show a msgbox with the sum of a column in the text.

The column is E
The first cell is E2
The range is every cell in column E (beginning with E2) that has a value in it
Needs to be rounded to two decimal places

I've tried the following but it doesn't work correctly:

MsgBox ("Invoice total is " & Sum("e2:e1000"))

Thanks