Yahoo! You're my hero - thank you so much.
Within the thread you gave me was a link to the solution on an Apple forum:
http://discussions.apple.com/thread.jspa?threadID=2567723&start=90&tstart=0.
Page 7 of this thread had the solution that worked for me, but I'll paste it here, to make it easier for those reading this:
"To make life easier for everyone, I thought I would post Apple's article here!
Resolution
iTunes will sync with Microsoft Outlook 2003, Microsoft Outlook 2007, or Microsoft Outlook 2010. If you use Microsoft Outlook 2000, you can resolve this issue by renaming the "OutlookChangeNotifierAddIn.dll" file. This file can be renamed however you choose, and is found in the following default location depending on your operating system:
* Windows XP, Windows Vista (32-bit) or Windows 7 (32-bit):
o C:\Program Files\Common Files\Apple\Mobile Device Support\OutlookChangeNotifierAddIn.dll
* Windows Vista (64-bit) or Windows 7 (64-bit):
o C:\Program Files (x86)\Common Files\Apple\Mobile Device Support\OutlookChangeNotifierAddIn.dll
If you install Microsoft Outlook 2003, Microsoft Outlook 2007, or Microsoft Outlook 2010 after renaming this file, you may need to reinstall iTunes 10 before being able to sync Contacts, Calendars, email account information, or Notes.
I renamed it OutlookChangeNotifierAddIn - problem file.dll "
I used the same name he did.
Thanks again.
Paula