Dunno Dude. That's the info gathered by the save_hwids utility. I'm fairly new to this twiddling with drivers malarkey, so I'm fumbling in the dark quite a bit.
I created a custom DP which works OK on all three machines using the .inf below. Still to test on new Dell Optiplex 745 system.
Edit: Also works on Dell 745 system.
;*******************************************************************************
;*                                                                            **
;*                     I N T E L   P R O P R I E T A R Y                      **
;*                                                                            **
;*   COPYRIGHT (c) 1999-2005 BY INTEL CORPORATION. ALL RIGHTS RESERVED.  NO   **
;*   PART  OF  THIS  PROGRAM OR PUBLICATION MAY BE REPRODUCED, TRANSMITTED,   **
;*   TRANSCRIBED, STORED IN A RETRIEVAL  SYSTEM,  OR  TRANSLATED  INTO  ANY   **
;*   LANGUAGE OR COMPUTER LANGUAGE IN ANY FORM OR BY ANY MEANS, ELECTRONIC,   **
;*   MECHANICAL, MAGNETIC, OPTICAL, CHEMICAL, MANUAL, OR OTHERWISE, WITHOUT   **
;*   THE PRIOR WRITTEN PERMISSION OF :                                        **
;*                                                                            **
;*                             INTEL CORPORATION                              **
;*                                                                            **
;*                          2200 MISSION COLLEGE BLVD                         **
;*                                                                            **
;*                     SANTA CLARA, CALIFORNIA 95052-8119                     **
;*                                                                            **
;*******************************************************************************
;* mesrl.INF                                                                 **
;*                                                                            **
;*   Based on: MSPORTS.INF                                                    **
;*             Copyright (c) 1994-1998 Microsoft Corporation                  **
;*                                                                            **
;******************************************************************************* 
[version]
signature="$Windows NT$"
Class=Ports
ClassGuid={4D36E978-E325-11CE-BFC1-08002BE10318}
Provider=%Intel%
CatalogFile = mesrl.cat
DriverVer=09/26/2006,5.2.0.1019
[DestinationDirs]
DefaultDestDir  = 11        ;LDID_SYS
; Drivers
;----------------------------------------------------------
[Manufacturer]
%Intel%=Intel, NTx86.6.0, NTx86.5.2, NTx86.5.1
[Intel.NTx86.6.0]
; Windows Vista
%E2987_serial.DeviceDesc% =  ComPort,  "PCI\VEN_8086&DEV_2987&CC_0700"
%E2997_serial.DeviceDesc% =  ComPort,  "PCI\VEN_8086&DEV_2997&CC_0700"
[Intel.NTx86.5.2]
; Winodws 2003 Server
%E2987_serial.DeviceDesc% =  ComPort,  "PCI\VEN_8086&DEV_2987&CC_0700"
%E2997_serial.DeviceDesc% =  ComPort,  "PCI\VEN_8086&DEV_2997&CC_0700"
[Intel.NTx86.5.1]
; Windows XP
%E2987_serial.DeviceDesc% =  ComPort,  "PCI\VEN_8086&DEV_2987&CC_0700"
%E2997_serial.DeviceDesc% =  ComPort,  "PCI\VEN_8086&DEV_2997&CC_0700"
[Intel]
; Windows 2000
%E2987_serial.DeviceDesc% =  ComPort,  "PCI\VEN_8086&DEV_2987&CC_0700"
%E2997_serial.DeviceDesc% =  ComPort,  "PCI\VEN_8086&DEV_2997&CC_0700"
;--------- SourceDiskNames and SourceDiskFiles Section -----------------------
; These sections identify source disks and files for installation.
[SourceDisksFiles]
prounstl.exe = 1
; COM sections
;----------------------------------------------------------
[ComPort.AddReg]
HKR,,PortSubClass,1,01
[ComPort.NT]
AddReg=ComPort.AddReg, ComPort.NT.AddReg
LogConfig=c14,c1a,c23,c2a,c34,c3a,c43,c4a,caa
SyssetupPnPFlags = 1
[ComPort.NT.HW]
AddReg=ComPort.NT.HW.AddReg
[ComPort.NT.AddReg]
HKR,,EnumPropPages32,,"MsPorts.dll,SerialPortPropPageProvider"
; Uncomment the following line if you want to override the advanced dialog for
; your device.  See msports.h for protoype of OverrideAdvancedFunction
; HKR,,EnumAdvancedDialog,,"yourdll.dll,OverrideAdvancedFunction"
[ComPort.NT.HW.AddReg]
HKR,,"UpperFilters",0x00010000,"serenum"
;-------------- Service installation
; Port Driver (function driver for this device)
[ComPort.NT.Services]
AddService = Serial, 0x00000002, Serial_Service_Inst, Serial_EventLog_Inst
AddService = Serenum,,Serenum_Service_Inst
; -------------- Serial Port Driver install sections
[Serial_Service_Inst]
DisplayName    = %Serial.SVCDESC%
ServiceType    = 1               ; SERVICE_KERNEL_DRIVER
StartType      = 1               ; SERVICE_SYSTEM_START (this driver may do detection)
ErrorControl   = 0               ; SERVICE_ERROR_IGNORE
ServiceBinary  = %12%\serial.sys
LoadOrderGroup = Extended base
; -------------- Serenum Driver install section
[Serenum_Service_Inst]
DisplayName    = %Serenum.SVCDESC%
ServiceType    = 1               ; SERVICE_KERNEL_DRIVER
StartType      = 3               ; SERVICE_DEMAND_START
ErrorControl   = 1               ; SERVICE_ERROR_NORMAL
ServiceBinary  = %12%\serenum.sys
LoadOrderGroup = PNP Filter
[Serial_EventLog_Inst]
AddReg = Serial_EventLog_AddReg
[Serial_EventLog_AddReg]
HKR,,EventMessageFile,0x00020000,"%%SystemRoot%%\System32\IoLogMsg.dll;%%SystemRoot%%\System32\drivers\serial.sys"
HKR,,TypesSupported,0x00010001,7
; The following sections are COM port resource configs.
; Section name format means:
; Char 1 = c (COM port)
; Char 2 = I/O config: 1 (3f8), 2 (2f8), 3 (3e8), 4 (2e8), a (any)
; Char 3 = IRQ config: #, a (any)
[c14]                   ; COM1,IRQ4
ConfigPriority=HARDRECONFIG
IOConfig=3f8-3ff(3ff::)
IRQConfig=LS:4
[c1a]                   ; COM1, any IRQ
ConfigPriority=HARDRECONFIG
IOConfig=3f8-3ff(3ff::)
IRQConfig=LS:3,4,5,7,9,10,11,12,14,15
[c23]                   ; COM2, IRQ3
ConfigPriority=HARDRECONFIG
IOConfig=2f8-2ff(3ff::)
IRQConfig=LS:3
[c2a]                   ; COM2, any IRQ
ConfigPriority=HARDRECONFIG
IOConfig=2f8-2ff(3ff::)
IRQConfig=LS:3,4,5,7,9,10,11,12,14,15
[c34]                   ; COM3, IRQ4
ConfigPriority=HARDRECONFIG
IOConfig=3e8-3ef(3ff::)
IRQConfig=LS:4
[c3a]                   ; COM3, any IRQ
ConfigPriority=HARDRECONFIG
IOConfig=3e8-3ef(3ff::)
IRQConfig=LS:3,4,5,7,9,10,11,12,14,15
[c43]                   ; COM4, IRQ3
ConfigPriority=HARDRECONFIG
IOConfig=2e8-2ef(3ff::)
IRQConfig=LS:3,5
[c4a]                   ; COM4, any IRQ
ConfigPriority=HARDRECONFIG
IOConfig=2e8-2ef(3ff::)
IRQConfig=LS:3,4,5,7,9,10,11,12,14,15
[caa]                   ; Any base, any IRQ
ConfigPriority=HARDRECONFIG
IOConfig=8@100-ffff%fff8(3ff::)
IRQConfig=LS:3,4,5,7,9,10,11,12,14,15
; End COM port LogConfig sections
[ComPort.NT.PosDup]
*PNP0500,*PNP0501,*PNP0502,*PNP0510,*PNP0511,*SMCF010,*NSC6001
; User readable strings
;----------------------------------------------------------
[Strings]
Intel="Intel"
Serial.SVCDESC  = "Serial port driver"
Serenum.SVCDESC = "Serenum Filter Driver"
E2987_serial.DeviceDesc = "Intel(R) Active Management Technology - SOL"
E2997_serial.DeviceDesc = "Intel(R) Active Management Technology - SOL"
I left the cat file in, even though I read somewhere it should be taken out. Anybody wants to use/improve the custom DP - go right ahead.