Why am I not getting shipping rates to Canadian locations?

If you are not receiving shipping rates to Canadian locations be sure that the addresses entered in the locations list the Province in two capital letter official abbreviations.  See chart below.
AB Alberta
BC British Columbia
MB Manitoba
NB New Brunswick
NL Newfoundland and Labrador
NS Nova Scotia
NT Northwest Territories
NU Nunavut
ON Ontario
PE Prince Edward Island
QC Quebec
SK Saskatchewan
YT Yukon