I would include headers on Sheet2.

A B C D
1 DATE TASK REVIEWED OK
2 9/15/05 Incoming
3 9/15/05 Outgoing


In cell C2 enter


=SUMPRODUCT(--(Sheet1!$A$1:$A$65535=$A2),--(Sheet1!$B$1:B$65535=$B2),--(Sheet1!$C$1:C$65535=C$1))

then copy across to cell D2, and down as far as you need. I also had to
make a correction to a previous mistake - I had omitted the "$" in front of
"65535" in my previous post - so be sure to include the "$" in your formula
(otherwise you will get an error when you start copying).