The function I posted above works at the printer level so an example of using it would look like...

Code:

fnRemapPrinter("\\oldserver\oldprinter","\\newserver\newprinter")


Here is one that remaps printers that just move to a different server, but retain the same printer share name...

Code:

fnRemapPrinters("oldserver","newserver")
 
Function fnRemapPrinters($sOldServer,$sNewServer)
	Dim $lIndex,$sPorts,$sServer,$sPrinter,$sPort,$sSplit,$lS,$sShare,$NUL,$Err,$sDevice,$sDefault,$sPrinterPorts
	Dim $sPrinters[100]
	$fnRemapPrinters=0
	$lIndex=0
	If @INWIN=1
		$sPorts="HKCU\Printers\Connections\"
		$sDefault=Split(ReadValue("HKCU\Software\Microsoft\Windows NT\CurrentVersion\Windows","Device"),",")[0]
		Do
			$sPrinters[$lIndex]=EnumKey($sPorts,$lIndex)
			$lIndex=$lIndex+1
			If Ubound($sPrinters)=$lIndex Redim Preserve $sPrinters[Ubound($sPrinters)+100] EndIf
		Until @ERROR
		Redim Preserve $sPrinters[$lIndex-1]
		For $lIndex = 0 to Ubound($sPrinters)
			$sServer=ReadValue($sPorts+$sPrinters[$lIndex],"Server")
			If SUBSTR($sServer,3,LEN($sServer))=$sOldServer
				$sPrinter=Split($sPrinters[$lIndex],",")[3]
				$NUL=AddPrinterConnection("\\"+$sNewServer+"\"+$sPrinter)
				If @ERROR
					$Err=@ERROR
				Else
					If $sDefault="\\"+$sOldServer+"\"+$sPrinter
						$NUL=SetDefaultPrinter("\\"+$sNewServer+"\"+$sPrinter)
					EndIf
					$NUL=DelPrinterConnection("\\"+$sOldServer+"\"+$sPrinter)
					If @ERROR $Err=@ERROR EndIf
					$fnRemapPrinters=$fnRemapPrinters+1
				EndIf
			EndIf
		Next
	Else
		$sPorts="HKLM\System\CurrentControlSet\control\Print\Printers\"
		Do
			$sPrinters=EnumKey($sPorts,$lIndex)
			If $sPrinters
				$sPort=ReadValue($sPorts+$sPrinters,"Port")
				$sSplit=Split($sPort,"\")
				If $sSplit[2]=$sOldServer
					$lS=Len($sPort)-Len($sOldServer)-2
					$sShare=Right($sPort,$lS)
					$NUL=WriteValue($sPorts+$sPrinters,"Port","\\"+$sNewserver+$sShare,"REG_SZ")
					If @ERROR $Err=@ERROR EndIf
					$sDevice=ReadProfileString ("Win.ini", "Windows", "Device")
					$sDevice=Split($sDevice,",")
					If $sDevice[2]=$sPort
						$NUL=WriteProfileString ("Win.ini", "Windows", "Device", 
							$sDevice[0]+","+$sDevice[1]+","+"\\"+$sNewserver+$sShare)
						If @ERROR $Err=@ERROR EndIf
					EndIf
					$NUL=WriteProfileString ("Win.ini", "Ports", $sPort)
					$NUL=WriteProfileString ("Win.ini", "Ports", "\\"+$sNewserver+$sShare, " ")
					If @ERROR $Err=@ERROR EndIf
					$sPrinterPorts=ReadProfileString ("Win.ini", "PrinterPorts", $sPrinters)
					$sPrinterPorts=Split($sPrinterPorts,",")
					$NUL=WriteProfileString ("Win.ini", "PrinterPorts", $sPrinters, 
						$sPrinterPorts[0]+","+"\\"+$sNewserver+$sShare+","+$sPrinterPorts[2]+","+$sPrinterPorts[3])
					If @ERROR $Err=@ERROR EndIf
					$sDevices=ReadProfileString ("Win.ini", "Devices", $sPrinters)
					$sDevices=Split($sDevices,",")
					$NUL=WriteProfileString ("Win.ini", "Devices", $sPrinters, $sDevices[0]+","+"\\"+$sNewserver+$sShare)
					If @ERROR $Err=@ERROR EndIf
					If Not $Err $fnRemapPrinters=$fnRemapPrinters+1 EndIf
				EndIf
			EndIf
			$lIndex=$lIndex+1
		Until $sPrinters=""
	EndIf
	If Not $Err $Err=0 EndIf
	Exit $Err
EndFunction


It will remap any printer the user has installed that is pointed to the old print server and remap it to the new print server. It will also work with 9x client, but they require a reboot whereas NT-based systems do not require a reboot.