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Can I run two versions of Microsoft Project side-by-side?

Running multiple Microsoft Project versions on one PC is possible but not recommended due to file association issues, compatibility problems, and potential data errors.

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Can I run two versions of Microsoft Project side-by-side?

A number of out customers have asked if there are any problems in installing and running multiple versions of Microsoft Project on a single client. Although this is a case of Caveat utilitor (Let the user beware), as long as the user understands and accepts the issues that can occur then they can do this.


Although Microsoft provide the ability to leave old versions of Office products (except Outlook) on your client when you are installing a new version of the product they certainly do not endorse doing so.

Can I run two versions of Microsoft Project side-by-side?

Figure: For Project you can choose to keep the old stuff

That being the case I would have preferred that they put a “(NOT RECOMMENDED)” after the options to impart that knowledge to the rest of us, but they did not. The default and recommended behaviour is for the newer version installer to remove the older versions. Of course this does not apply in the revers. There are no forward compatibility packs for Office.

There are a number of negative behaviours (or bugs) that can occur in this configuration:

You may get unexpected negative behaviours if you are using shared resource pools or resource pools even when you are not running multiple versions as I have found that they can get broken very easily. If you need these thing then it is probably best to use Project Server as it was created to solve many of these specific issues.

Note: I would not even allow multiple people to access a network copy of a Project file because of the way Windows locks files in write mode. This can cause write-locks that get so bad a server restart is required I’ve seen user’s files get write-locked to the point where the only resolution is to reboot the server.

Changing the default version to run for an extension

So what if you want to change the default association from Project 2007 to Project 2010?

Can I run two versions of Microsoft Project side-by-side?

Figure: “Control Panel | Folder Options | Change the file associated with a file extension”

Windows normally only lists the last version installed for a particular extension. You can select a specific version by selecting the program you want to change and clicking “Change program… | Browse…” and then selecting the .exe you want to use on the file system.

Can I run two versions of Microsoft Project side-by-side?

Figure: You will need to select the exact version of “winproj.exe” that you want to run

Conclusion

Although it is possible to run multiple versions of Project on one system in the main it does not really make sense.

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