XPostFacto for Mac

Used XPostFacto for Mac?

XPostFacto Analysis

AI Assisted Content · June 11, 2026

Not written by CNET Staff.

XPostFacto is a utility designed for Mac users, primarily focused on enhancing the compatibility of older Mac OS versions with unsupported hardware. This tool allows users to install Mac OS on machines that do not officially support it, enabling access to legacy software and features. With its user-friendly interface, XPostFacto simplifies the process of creating bootable installations, making it easier for users to manage their operating systems.

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Trial version

The program provides essential functionalities such as kernel extension support and bootloader management, which are crucial for running older Mac OS versions on newer hardware. It also includes recovery options and troubleshooting tools to assist users in resolving common issues during installation. Overall, XPostFacto serves as a valuable resource for those looking to extend the life of older Mac systems or explore legacy software environments.

XPostFacto for Mac

Used XPostFacto for Mac?

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Full Specifications

GENERAL

Release: September 4, 2005

Latest update: June 11, 2026

Version: 4.0

OPERATING SYSTEMS

Platform: Mac

Operating System

Mac OS X 10.3.9
Mac OS X 10.1
Mac OS X 10.3
Mac OS X
Mac OS X 10.0
Mac OS X 10.4
Mac OS X 10.2
Mac OS Classic

Additional Requirements: Power Macintosh 7300 - 9600, or equivalent clone, or Original Powerbook G3 , Powerbook 2400 or 3400, or Beige G3 or Wallstreet Powerbook Mac OS 9 or higher Mac OS X 10.x, or Darwin 6.x or 7.x, to be installed

POPULARITY

Total Downloads: 1,097

Downloads Last Week: 0

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Last Updated

User Reviews

4.2/5

101 User Votes

Success!
guy_upstateJune 5, 2007
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Summary
This review was originally posted on VersionTracker.com.<br />I've been running OS 10.3.9 for about a year now on my 8600 (288mb ram) thanks to this application and a Sonnet G3/400 upgrade. It's a duel boot system with OS9 on one partition and OSX on the other. Saved me big $$$!!! Thanks!
damn.
plaintigerJanuary 1, 2006
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This review was originally posted on VersionTracker.com.<br />i'm in a really good mood tonight - a number of things have been going well latelly, and one of them is that thanks to XPostFacto and the great people at OWC i've got my trusty old 300 MHz Wallstreet PowerBook running Tiger - 10.4.3, in fact - as smooth and easy as if Apple intended it. XPostFacto has never worked for me with just one click like it does for some people; i don't usually wind up with a successful installation before the sixth or seventh try (or more)...twice i'll get a panic; two more times i wind up perpetually "still waiting for root device"...another time everything seems to go great until i get to the very end of the installation process and instead of "Finishing Installation..." i see text telling me to try installing again (no explanation given)...and so on. for me, the process has been fraught with difficulty. but i got it done quicker with XPF 4 than i did with...whatever version i used to put Panther on this machine...and also, the difficulty i have getting the installation to work right just increases, exponentially, the satisfaction i derive from finally tasting success. i love this software. i really will pay for it soon. i promise. OWC deserves $25.00 (at least!) for giving my beloved PowerBook not one, but two new leases on life now. what an amazing feat of software engineering. really.
WOW!! Tiger is running like clockwork!!
crazynurseNovember 7, 2005
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This review was originally posted on VersionTracker.com.<br />Awesome. Spent 10 hours that I will never get back trying to update Tiger on a 10.3.9 Lombard Powerbook 400mhz without a firewire. I was ready to give up and came across this program and thought "why not?????." So I downloaded it and put in the Tiger DVD and then pressed a button and 1 hour later a fully functional Tiger running flawlessly. What I tried BEFORE Xpostfacto(10 painful hours): Booting a target computer(my G5 20inch imac superdrive) using "t" and a firewire connection. Using a program with "cloning" -didn't work. Using an external firewire with an external hardrive.--no luck! Using my Ipod with Tiger installed on it(which is a genius idea I found by someone on a mac forum that installed Tiger on my computer and all of my friends---use disk utility for that)then boot up under the startup disk under your Ipod.That didn't work on the lombard either.......The only solution... XPOSTFACTO! You rock! Thanks!!
Very useful
Mac-Fan No 1September 16, 2005
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This review was originally posted on VersionTracker.com.<br />Thanks for this great software! <br>Works very well on my G3/233 so that I can use this old machine (<b>seven years!</b>) as a download server in the internet!
Just the ticket!
MathueSeptember 5, 2005
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Summary
This review was originally posted on VersionTracker.com.<br />I've been using Xpostfacto ever since it came out. More often than not it works, usually quite well. I've used it on a UMAX S900 and a Wallstreet 300mhz. It keeps these admittedly elderly machines useful and productive. There are drawbacks obviously, OEM video on these old machines isn't up to the task viewing a Quicktime or DVDs, they lack the needed horsepower. Any nearly any other task however they will do fine. My old Wallstreet for example wiles away it's final years doing coffee table duty, whether checking IMDB or streaming iTunes to an Airport Express with an off the shelf 802.11g PCMIA card.
ABSOLUTELY WONDERFUL!
Digitol3September 5, 2005
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This review was originally posted on VersionTracker.com.<br />I had a chance to quickly chat with the developer at the last MacWorld in SF. This guy is the kindest, most brilliant man ever. Thanks very much for software like this, and best of all thanks for keeping it reasonably free. Great work. Thanks for this, once again! :)
Runs Well on PowerTower Pro
macguruguySeptember 4, 2005
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This review was originally posted on VersionTracker.com.<br />Running Tiger on PowerTower Pro with Sonnet 800mhz G4. Runs pretty darn well in fact! I highly recommend this as a way to save your old mac and actually use it. I gave mine to my daughter for school -- she loves it!!
Brilliant!
skyo63July 16, 2005
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This review was originally posted on VersionTracker.com.<br />Tiger 's no longer an excuse for ditching that old PM! Big thanks to RR.
Great stuff!
warbus--2008May 3, 2005
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This review was originally posted on VersionTracker.com.<br />Wow my mac is 10 years old now! lol Wintel. Thank you, thank you!!!!!!!! XPostFacto works great! It is great. I have it on my PowerMac 7500 with: ;) G4 800 Mhz 640 Megs of Ram Radeon 7000 Video Card USB 1.4 card Sonnettec Combo Card ATA133/FireWire/USB 2.0 80 Gig IBM 7200 SCSI 12x internal cd rom FireWire external 52x CD/CDRW/CDR And with an Epson CX6400 all in one 2 ZIP drives external and internal. 2 Floppy drives external and internal. Built in bootable SCSI internal and external. ADB ports. on board Serial too ;) Built in Apple Video addapter RCA in and out. I'm not too sure if I'm getting 2.0 USB though. when I plug my epson in to the combo card it has issues. But when i plug it into my usb 1.4 card it works great. Scanning printing etc. Also iSite video can just go black. I'm assuming because of the slow bus speed on my 7500. And a quick tip. If your gona use a big drive on a machine like mine. Format it first with your first partition being less than 8 gig. Your system will not let you install OSX on a drive bigger than that. not sure why. But your welcome to try it and show me how you did it. Also I can't get the RCA Video in to work. But the FireWire works. so thats kewl.
Still excellent!
bigpoppaApril 19, 2005
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This review was originally posted on VersionTracker.com.<br />Been using this utility since day one almost and it just keeps getting better! I also agree with everyone else, colferret, RTFM!!!

Developer’s Description

By Other World Computing

install OS X on unsupported Macs

Helps to install and boot Mac OS X, Mac OS X Server, and Darwin on certain unsupported systems. When Mac OS X installs successfully, its stability on unsupported systems appears to be excellent. However, there are cases in which Mac OS X is difficult to install, and there are a variety of problems you can run into. So read the documentation carefully.