Here's one way.
Add a couple of helper columns that determine the first to last rows to count based on being between rows with titles in column B Task List and Task Status.
So, In Metrics, U3:
=MATCH("Task List",INDIRECT(TEXT(W3,"00")&"!$b:$b"),0)+1
in Metrics, V3:
=MATCH("Task Status",INDIRECT(TEXT(W3,"00")&"!$b:$b"),0)-1
both copied down.
Then, so formula copying will be easier, change the dates in X2:AI2 to the first of each month, e.g. Jan 1, 2011, Feb 1, 2011... etc.. and format as custom: mmm
Then change formula in X3 to:
=COUNTIF(INDIRECT(TEXT($W3,"00") & "!$S"&$U3&":$S"&$V3), ">="&EOMONTH(X$2,-1)+1)-COUNTIF(INDIRECT(TEXT($W3,"00") & "!$S"&$U3&":$S"&$V3),">"&EOMONTH(X$2,0))
copied down and across all the monthly columns.
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