If you purchased Office 2010 and want to use Outlook to send mail from other applications (like QuickBooks), use add-ins or sync with a smartphone, you do not want the click-to-run installation.
Click-to-Run installs in a virtual space. This is great because it allows you to have two Outlook’s installed and want to try Office 2010 but add-ins and sync software won’t work with it.
If you installed Office 2010 Click-to-Run and it does not meet your needs, you can uninstall It and install Office 2010 by using a method other than Click-to-Run. To do this, follow these steps:
- Uninstall the Click-to-Run version of Office 2010 from Control Panel.
- Visit the site where you purchased Office 2010, and sign in with the same Live ID that you used when you first purchased Office 2010.
- Click the My Account link at the top of the home page to access your Office downloads.
- Click the Download button for the suite that you purchased, and then click the Advanced Options link under the Download Now button. There is a version of Office 2010 listed that is not Click-to-Run and that does not require an available Q: drive.
Office 2010 Click-to-Run compatibility with add-ins
http://support.microsoft.com/kb/982431
Related posts:
« « Tip 762: Facebook Users Beware!Tip 764: Social Connector & Instant Search » »

How do I know if I have Click-to-Run version of Office 2010 installed on my computer.
It’s only available in Home and Business and the Home & Student versions purchased (and installed) online, so if you installed from a CD, its not C2R.
Do you have a Q:\ drive?
What version does File, Help say you have?
Great Answer! I now know I do not have C2R.
Thank you.