What is this CPU activity?

I have been having trouble with the SBBOD when I'm in Mail. A few days ago I completely reinstalled my OS X 10.8.4 and I'm still having problems. Last night I started watching my Activity Monitor. This morning I only had Mail open and everything seemed to be going fine and then, while I was composing an email, I went to look at another email in one of my folders. That's when my SBBOD appeared. Prior to doing this, my % User was less than 10%. Now my Mail isn't even open and my %User is 90%+. The areas getting the highest % appear to be Calendar Agent, AddressBookManager, AddressBookSourceSync and com.apple.doc.extra. They are fluctuating between 40%+ and 86% CPU. What is going on? How do I stop whatever it is that's going on behind the scenes and using up my CPU?

I may have just solved my own problem. I went into System Preferences>iCloud and unchecked Contacts and other things. Then I decided to just shut iCloud off completely, since I don't use it. I now have Mail open and my Activity Monitor shows %User: 3.01.
I sure do learn a lot from you folks. :-) Thank you all for so generously volunteering your time.

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