Take a look at this formula, it takes a date in a1 then subtracts the the
number of days in the month before to return the month number of the month
before. Since it uses the days in the previous month, it can never go back
two months if that makes since.
=TEXT(A1-(TEXT(EOMONTH(A1,1),"dd")),"mm")

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-John
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"Sandy" wrote:

Hello
I have a monthly file My File mm-yyyy.xls. I am trying to reference last
months file using cell C1 (Named month) and indirect.ext using
cell("FILENAME'). The month portion of the formula is evaluating to 01 no
matter the month.
My formula:
=INDIRECT.EXT("'"&LEFT(CELL("FILENAME",A1),FIND("-",CELL("FILENAME",A1))-3)&TEXT((MO-1),"MM")&"-"&YR&".xls]Monthly Summary'!$"&"b$37")

What should I change in TEXT((MO-1) so it will evaluate to the previous
month. I realize that January will be a problem and plan on manually
entering the values unless some one has a suggestion for that too.

Thanks!!!