Should I get 32- or 64-bit Office 2010?
With the release of Office 2010, you have the option of choosing either 32-bit or 64-bit versions when you install.
Which should you choose?
Actually, the decision's fairly simple:
- If and only if you work with Excel spreadsheets of over 2 gigabytes and don't mind losing your current add-ins and Active-X controls in all of your Office apps, then choose 64-bit Office.
- Otherwise, install the 32-bit version.
And more on this Technet blog page
Here's the relevant bit:
"If users in your organization depend on existing extensions to Office, such as ActiveX controls, third-party add-ins, in-house solutions built on previous versions of Office, or 32-bit versions of programs that interface directly with Office, we recommend that you install 32-bit Office 2010 (the default installation) on computers that are running both 32-bit and 64-bit supported Windows operating systems."