As of 2009 Canadian charities need to file the T3010B form for year ends after January 1, 2009.  For almost all charities they have no more use for the T3010A.  CRA has removed the old T3010A form because so many charities were mistakenly filing the t3010A when in fact they should be filing the T3010B Anyway there are reasons that one may want to look at a T3010A including if you are making application for reregistration and you are required to complete the T3010A or you are wondering about the CRA database and what number aligns with what question.  Anyway CRA has done a good job hiding the form to keep it away from you those who might mistakenly use it.  Here is a copy of the T3010A if you require