When I access my Microsoft Account at the http://commerce.microsoft.com/ web site I see a drop down at the top, as shown in this screenshot:

Why do I have a "CA - Personal Account", a "CA - Business Account 1", a "CA - Business Account 2", and a "US - Personal Account"?

I recently had two XBOX Avatar Items disappear from my account - they were withdrawn from the store - and I contacted XBOX Support.  I had the items credited to my account and they, plus a recent avatar purchase, appear under the "US - Personal Account".  Shortly after this, as documented in another thread, my Windows Phone 8 Wallet became corrupted:

I have two payment options on my account, a Visa and my PayPal.  Rogers is the name of my cell carrier in Canada, and should not be there.

What has happened?  Why do I have so many "accounts" under my Microsoft Account?