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Changing filing status from MFS to MFJ

I filed my 2010 taxes as married filing seperately because my spouse owed back taxes.  I just found out that I could have completed an injured spouse form and was told to amend my 2010 taxes.  However, my spouse also filed mfs.  Do I need to amend his as well?
    No, you will only amend one of the returns because you will now include all of both your informnation on the one Married Joint return