Helping people with computers... one answer at a time.

Depending on the situation, the number of machines you can install a single copy of Microsoft Office on is unclear.

I wanted to know if we're allowed to use a legal copy of Microsoft Word (legally meaning I purchased the disk) on more than one computer. I switched computers and now I need to install it on a different computer than the one I'd been using before. The old computer is still active. Can I re-install on my new computer? Will it recognize and allow me to use the product key?

If you're moving from one computer to another, the answer is easy. But if you're adding an installation, the answer isn't quite as clear.

If you're moving your installation of Office (or Windows, or pretty much any licensed software package) from one machine to another, the answer is simply "yes". That means you plan to stop using the package on the old machine, and start using it on the new. No problems, no conflicts, and no questions. About the worst this scenario might get is with over-aggressive anti piracy techniques that might require you to contact the software's manufacturer to verify that you're moving, and not copying, the installation in order for its activation to succeed.

On the surface, copying is also simple: it's illegal. Regardless of whether the application can be installed on another machine, and whether or not it works, most software license are "single seat"; meaning that you're allowed to have the software installed on only one machine at a time.

In practice things get just a little grayer than that, though. Some software publishers have license agreements that state you may install on a certain number of machines as long as only one is in use at any time. Others allow you to make a single copy of the software as a backup.

For Microsoft Office specifically, I was lead to believe some time ago that one could install it on up to three machines for personal use. Today I must assume that's wrong, as I can find no documentation to back that up.

"On the surface, copying is simple: it's illegal."

There are plenty of options besides purchasing an additional copy of Office, especially if you can't justify the additional cost. Consider:

  • Purchasing just the program (Word, Excel, etc.) you need, rather than the entire package.

  • Check out eBay, not only for bargains, but also for new copies of older versions of Office which are often found at a steep discount. You may not need all the latest and greatest features, so why pay for them?

  • Open source alternatives such as Open Office. Besides being free, the software is compatible with current Microsoft products, and quite good.

Article C2212 - November 1, 2004 « »

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Leo Leo A. Notenboom has been playing with computers since he was required to take a programming class in 1976. An 18 year career as a programmer at Microsoft soon followed. After "retiring" in 2001, Leo started Ask Leo! in 2003 as a place for answers to common computer and technical questions. More about Leo.

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Recent Comments
74 Comments
Joe C
November 1, 2011 11:04 AM

I searched through these comments and saw nothing about it discussed, so here's a monkey wrench: how would this apply to a virtual machine? On my home iMac I have WinXP installed, and on that I have Office 2007. If I also wanted to add another virtual environment -- in this case, Win7, and wanted to add Office 2007 on it as well, would it be kosher? I take the term "seat" as being the computer itself, not the operating system. Please help clarify this for me before I go breaking the law! Thanks!

Ron Barker
November 1, 2011 3:35 PM

Hi

I have office 2003. You can find the licence by clicking on help>about microsoft word (or excel etc.) then on the link "view full end user licence"

Dan
November 2, 2011 9:00 AM

I just purchased Office, and on the box it says I can install it on 3 computers, just like it says on the box that came with my virus protection software. Not sure why everything is in 3's, but with my wife's and my two laptops and 1 desktop - 3 is a perfect number for us.

Jim
March 6, 2012 10:16 PM

My package states - Office Home & Student 2007 is licensed for noncommercial use on up to 3 personal computers. I have Office Professional 2007, so I guess I'm buying a new one.

jim
June 17, 2012 4:26 PM

how am I able to prove to ms that one of the systems that I had office 2007 on is no longer in service and I no longer have the laptop