I don't think every School Board has their March Break at exactly the same time. Some a week before some a week after the above mentioned dates. I could be wrong.
As noted on the webpage from the Ministry of Education website, local school boards may be given permission by the Ministry to deviate from the posted calendars. The TDSB did this with the March break in 2004-2005 and shifted March break a week later to avoid a situation where students came back from break for four days and then were off again for Good Friday and Easter Monday. There is the potential for the same situation in 2007-2008. In other words, I'm thinking that there is a chance that some school boards will want to move the March break to have it start on Fri March 16 and have it end on the Thursday before Good Friday.
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