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I think there are a few questions around whether Office 2000/XP vs. Office 2007/2010 can be installed side by side on the same Windows (XP).

My case currently uses Outlook/Office XP and I am investigating if it would be possible to additionally install Outlook/Office 2010 on the same machine and then (for a short period) use Outlook 2010 alongside Outlook XP.

Would there be any specific complications using two versions of Outlook on the same machine? (Emails are retrieved via IMAP, no Exchange or pop3 here, so I do not expect any problems on the email protocol side.)

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xlink : superuser.com/questions/141522/… –  Martin Oct 14 '10 at 7:08

4 Answers 4

up vote 4 down vote accepted
+50

This Microsoft article discusses this same issue:
Information about using 2007 Office suites and programs on a computer that is running another version of Office.

In general, Office 2007 can coexist with earlier versions, but Oulook apparently cannot :

Multiple versions of Outlook

Microsoft Office Outlook 2007 cannot coexist with any earlier version of Microsoft Outlook. When you install Outlook 2007, the Setup program removes Microsoft Office Outlook 2003, Microsoft Outlook 2002, and Microsoft Outlook 2000. The Setup program removes these versions of Outlook even if you click to select the Keep these programs check box in the Removing Previous Versions dialog box.

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Oh bloody great. Cheers for that Info! –  Martin Oct 14 '10 at 6:13
    
It also Applies to 2010 : support.microsoft.com/kb/2121447 –  Martin Oct 14 '10 at 6:14
    
Martin, I wonder what will happen if you disobey Microsoft's directives and install Outlook XP after installing 2007. The installation of XP won't (probably) uninstall 2007, so they would be in effect side-by-side. This might even work, but I suggest trying it in a virtual machine, since it has the potential of in addition making both versions impossible to uninstall. For the rest, such as program shortcuts, follow the directives in this article. –  harrymc Oct 14 '10 at 6:21

To add the same quote for Office 2010 as harrymc added for 2007:

Multiple versions of Outlook Microsoft Office Outlook 2010 cannot coexist with any earlier version of Microsoft Outlook. When you install Outlook 2010, the Setup program removes Microsoft Office Outlook 2007, Microsoft Office Outlook 2003, and Microsoft Outlook 2002. The Setup program removes these versions of Outlook even if you click to select the Keep these programs check box in the Removing Previous Versions dialog box.

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You would need to use a virtual machine. Something like Virtualbox does the trick. Install the OS inside Virtualbox then clone it for each Outlook version and install your Outlook versions on each VM. I use this trick for html email testing

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Here is the in-depth reason why you cannot run any Outlook versions side-by-side.

Essentially, it's a "last one wins model" where the last COM component registered will be activated.

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That sure is in depth.... Lot of PIA'S.... –  Joe Taylor May 15 '12 at 13:47
    
@JoeTaylor It does provide more details than stating "it will be removed by installing newer versions". It describes the technical limitations with the Office COM architecture. –  SliverNinja May 15 '12 at 13:54
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Yeah it's a very interesting article that thoroughly explains why it can't happen. It would probably be worth including the text as if that link dies its quite a useful resource lost. –  Joe Taylor May 15 '12 at 14:59

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