Q: How do I install 64-bit Outlook 2010 from the Office 2010 installation DVD?

A: I have the Microsoft Office 2010 DVD for installations. This media, as you or a customer might obtain from a retailer (or even TechNet), contains both the 32-bit and 64-bit versions of Office, which includes Outlook 2010 as well as Word 2010, Excel 2010, Access 2010, and PowerPoint 2010. You can install Outlook 2010 by itself or with any combination of applications from the Office suite. Although I'm sure most of you use some centrally managed deployment tools, including workstation images, there's a minor catch if you intend to install the 64-bit version of Office from the DVD media.

Obviously, the 64-bit version of Office requires a 64-bit version of Windows, as we discussed in "64-Bit Outlook 2010: Mind Your Bitness." Even with 64-bit Windows, if you let autorun launch setup.exe, found at the root of the DVD as Figure 1 shows, Office installs the 32-bit version of Office without prompting for a choice.

Figure 1: The Office 2010 installation disk showing setup.exe at the root of the DVD

If you want to install the 64-bit version from the Office 2010 DVD, you must navigate to the x64 folder, which contains the entire 64-bit Office 2010 installation, and launch setup.exe from there.

Should you mistakenly install the 32-bit version of Office 2010, you have to uninstall it completely before you can then install the 64-bit version. The two cannot coexist on a single Windows installation.

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