WinFLP works just fine on older notebooks. I've even installed it on a fewer of the low spec new notebooks we've purchased and I've had only a few isolated issues. These issues were due primarily to the Windows Installer that ships with WinFLP. A quick trip to Windows Update fixed it pronto. Regarding you primary concern, Hibernation works just fine with all the notebooks we've installed WinFLP on. WinFLp goes into and comes out of Hibernation pretty quickly. Are you anticipating issues or have you experienced any with WinFLP specifically? I'd like to know if anyone else has had issues. I have noticed that driver support for WinFLP is essential. I've come to realize how much we've relied upon MS-provided drivers for power-management with our notebooks. Installing the vendor-provided ACPI drivers has worked fine though, as WinFLP relies on the WinXP x86 code base. I've yet to experience any driver issues related specifically to WinFLP. NOTE: WE install with both the "Driver Support" and "Local Mgmt" tools. All together, this represents a tiny 850MB install footprint. WinFLP screams on older notebooks when compared to WinXP. I've been very surprised with how well it works. We'll be deploying VMware ESX with VDI shortly, and I intend to use WinFLP on the majority of the virtual desktops we deploy. It's memory footprint is very low and it seems to offer performance similar to what we see with WinXP. I've yet to have a user notice any difference. We'll deploy using VMware and RIS tools, so our desktop management will automated to pretty high degree. Also, I've attached a JPG of one of our development VMs running WinFLP with Office 2007. Even with Word 2007 open and running, the memory consumption is ridiculously low.