Europa International Sweepstakes probable scam West Memphis, Arkansas

Received 12-1-2010 in a plain white envelope with no return address mailed in Canada a letter along with a check in the amount of $2,950.85  stating that I had won $100,000.00 and the check was to cover the processing fee and duty taxes.  The reported cashiers check was drawn on Bank One, Pheonix AZ and was signed by the Drawer: JP MOrgan Chase Bank, NA.  I was told that the check could not be cashed until I called Ms Cheryl Anerson at1-877-742-3440 to activate my claim.  Also mentioned was that I was not to discuss this matter nor cash the check until the claim had been processed.  Don't know why I am suspect that this is a scam but will list my first thoughts:

1. Letter mail in Canada

2. Company address in Arkansas

3. Bank in Arizona

4. Plain white envelope, no return address.

5. Asked not to discuss and deposit check until transaction finalized (probably meaning until they get some money from me.

Will have to check with the Telephone company and see if Bank One (no address on check) exists and what number if any is listed in the Phoenix Telephone directory.  Number listed on the check is 1-888-774-0757 which I'm sure is directed to some partner in crime along with that of Cheryl Anderson.