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Posted to microsoft.public.excel.worksheet.functions
Harlan Grove Harlan Grove is offline
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Default =IF(C1=""," ","ImportID-01")

Outlook, eh? wrote...
....
=IF(M2="","","ImportId-"
&TEXT(SUMPRODUCT(--ISNUMBER(SEARCH("Import",$K$1:K1)))+1,"00"))

....

Maybe try

=TEXT(SUMPRODUCT((TRIM(M2)<"")*(TRIM(M
$2:M2)<"")),"""ImportID-""00;;")