Should I get 32- or 64-bit Office 2010?
When you install Office 2010, you have the option of choosing either 32-bit or 64-bit versions. Which should you choose?
The simplest answer: If you don't know WHY you need 64-bit Office, then you DON'T need it. Install the 32-bit version instead.
I have a 64-bit version of Windows. Do I need to install 64-bit Office to match?
No. You can install either 32- or 64-bit Office.
32-bit Office may perform better on 64-bit Windows 7 than on 32-bit Windows 7. Windows 32-bit can use no more than 4 GB of memory. If you have more than that, 64-bit Windows can use it and make it available to Office and your other apps - whether they're 32-bit or 64-bit.
If you have a 32-bit version of Windows, the decision's already made for you. You can't install 64-bit Office in 32-bit Windows.
Isn't the 64-bit version of Office better/higher/further/faster/more [whatever] than the 32-bit version?
Yes and no.
If you work with Excel spreadsheets of over 2 gigabytes or huge Project files, you may want to choose 64-bit Office. However, you may lose the ability to use the add-ins and Active-X controls in all of your Office apps.
64-bit PowerPoint has no advantages over the 32-bit version.
Why should I believe you? What does Microsoft say about it?
Glad you asked!
That page also explains how to install 64-bit Office and lists a number of other applications that may "block" your ability to install it.
There's more about 64-bit Office on this Technet blog page, but 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."