Over a year ago we published a tip detailing how to change the serial number on an installed copy of Microsoft Office X or Microsoft Office 2004. That tip described a technique for digging around in library preferences, and hunting down an invisible OfficePID file.
It turns out there is a much, much, easier method!

The Remove Office tool that comes with Microsoft Office 2004 has a hidden feature that removes the serial number on installed copies of Microsoft Office (both version X and 2004).
Tip: You can find the Remove Office app in the Microsoft Office 2004 application folder inside the Additional Tools folder.
When you see the the initial “Welcome to Remove Office” splash screen, hold down the Option key. The Continue button will change to read “Remove Licensing Information Only.”
When you click the button, a second screen appears warning you that “files you no longer need must be removed from your computer.” These files include that difficult OfficePID file. Make sure all your Microsoft Office applications are not running, and click “Remove.”

The Remove Office tool will process for a bit. When it is done you can quit (ignore the warning that nothing was removed). When you launch Word, Excel, PowerPoint or Entourage the next time, you’ll be presented with the opportunity to enter a new serial number.
Now, that’s much easier! No hidden OfficePID file, no preferences.
Tip: What if you need to change the serial number for Microsoft Office X, and don’t have access to 2004′s Remove Office tool? Here’s a trick: Download the free Office 2004 Test Drive which includes the needed Remove Office tool!
Source: The difficult version of this tip (Tip #43 Change Microsoft Office’s serial number) was published on May 30, 2005. Since then about 50 people a day have visited that tip through various Google searches. We were delighted to discover this easier technique on the great Mac OS X hints website.
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Ten wpis znalazłem w google i strasznie sie z tego ciesze bo na pewno tu jeszcze zajrzę. Póki co blog ląduje w zakładce ulubione. Pozdrawiam
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The flow of information is actually smooth. This kept me hooked on it,
Pls I need microsoft office 2005 serial number rather.thanks
Pls I need ms office 2005.Thanks
Thanks this was a good read
Remove office worked great
hi, do you know where i can find a new serial number for office 2004(for mac) it just happen to me. Can’t open my office because somebody else is using the same serial number
thanks
Craig, all i have to say is, THANK YOU!!!
I have been needing do this for a while because i was dumb and used my serial key twice on two machines on the same network…
you should have this a seperate page…because it’s hard to find info like that!!!
Craig is a genius. It works perfect!!! Thanks a bunch.
Craig speaks the truth. His method worked like a charm for the 2008 version
It looks like we should run an updated tip for changing the serial number for Office 2008, because this method does not work with the latest upgrade. Here is a reported method from entourage.mvps.org:
Delete these two files on one of the machines:
~:Library:Preferences:Microsoft:Office 2008:Microsoft Office 2008 Settings.plist
where ~ is your home folder, and
HD:Applications:Microsoft Office 2008:Office:OfficePID.plist
When you start an Office app, you’ll be asked for a CD Key.
(Happily, the 2008 version of OfficePID.plist is no longer an invisible file.)
WOW that was EZ
Thanks
Did not work for me either. Office just started again as usual. Tried on an Intel Mini and MacBook–had to do the whole reinstall!!!
Realised I had the same serial on my new MacBook as my iMac after transfering everything via Target Disk Mode. As I had the Edu version of Office I thought I could simply change the serial with this tip. Unfortunately I have tried this on both machines without any success at all and ended up uninstalling and then reinstalling office
Ug, how PC of me!
What is the ¨option key¨?=)
Geez, doesn’t work for me. Even tried the older tip. Deleted all that stuff, but the Test Drive is still running. BIZARRE?!
HELP ME! I WANT MS OFFICE!
sorry, posted before but with wrong e mail. now you have my correct one, any suggestions what I can do?
Tried it with test drive ages ago and it worked. Tried it again after downloading testdrive just today and it didn’t work. Has something changed?
doesn’t work for Office 2004 test drive… doesnt ask for a serial..just starts the 30 day trial over again..
Sorry but what does it mean ‘splash screen’ ?