It shouldn't be a problem.

Here is a new version, with the main code as a UDF so you don't have to keep repeating it.

This new version allows wildcards, so you could do "udfPurgeFiles("H:\backup\out*.txt",5) to keep the last 5 files which match "out*.txt" in the H:\backup directory.

Code:
Break On
 
$sDirToPurge="H:\egnadata\Backup\CIC"
udfPurgeFiles($sDirToPurge,10)
If @ERROR " ERROR: Could not purge '"+$sDirToPurge+"'"+@CRLF+"REASON: " @ERROR " " @SERROR+@CRLF EndIf
 
$sDirToPurge="H:\egnadata\Backup\Outlook"
udfPurgeFiles($sDirToPurge,10)
If @ERROR " ERROR: Could not purge '"+$sDirToPurge+"'"+@CRLF+"REASON: " @ERROR " " @SERROR+@CRLF EndIf
 
Exit 0
 
Function udfPurgeFiles($sPath,$iLimit)
	Dim $sResult,$sFile
	Dim $sDirPath
 
	$sDirPath=$sPath
	If Not (16 & GetFileAttr($sDirPath))
		; Not a directory - maybe there is a search term?
		$sDirPath=Left($sDirPath,InStrRev($sDirPath,"\")-1)
	EndIf
	$sResult=udfPipe('"'+%COMSPEC%+'" /C dir /a-d /o-d /b '+$sPath)
	If @ERROR Exit @ERROR EndIf
	For Each $sFile in Split($sResult[0],@CRLF)
		If $sFile
			If $iLimit
				"Will not delete file "+$sDirPath+"\"+$sFile+@CRLF
				$iLimit=$iLimit-1
			Else
				"Will delete file "+$sDirPath+"\"+$sFile+@CRLF
				; *** Uncomment the next line to enable the delete payload ***
				; DEL $sDirPath+"\"+$sFile
			EndIf
		EndIf
	Next
	Exit 0
EndFunction
 
; Execute a command and return output and error streams
; This code adapted from Chris S. WshPipe() http://www.kixtart.org/ubbthreads/showflat.php?Cat=&Number=8257
Function udfPipe($sCommand)
	Dim $oExec
	Redim $udfPipe[2]
 
	$oExec = CreateObject("WScript.Shell").Exec($sCommand)
	If Not VarType($oExec)=9 $udfPipe[1]=@SERROR Exit @ERROR EndIf
 
	$udfPipe[0] = $oExec.StdOut.ReadAll
	$udfPipe[1] = $oExec.StdErr.ReadAll
 
	Exit $oExec.ExitCode 
EndFunction ;}}}


If it is *still* selecting the wrong files, check the timestamps on them, and see what the DIR command does if you type it on the command line.

PS, I've disabled the "DEL" in the UDF to avoid accidents. Just remove the comment character to activate it.