I have CRM 2011 for Outlook installed and I have two email accounts. One is my work account (email@example.com) and the other is a general inbox which receives all customer emails (firstname.lastname@example.org).
Obviously these aren't the real names of the emails, but it's for this example's sake. I have no trouble tracking emails in CRM using my account, but when I go to click "Track in CRM" for any of the customer emails, the functionality is disabled,
the "Set Regarding" is grayed out, etc.