Although many of my paragraphs are obsolete, I have never removed any of them from my 41 page Word document, like these two:

Based on the information on your <@FDICurYear> tax return, the estimated amount of the Economic Stimulus Tax Rebate that you will receive is $<@FDIRebate>.

Based on the information on your <@FDICurYear> tax return, the amount of the Economic Stimulus Recovery Rebate Credit that you will receive is $600.00. You could not receive it earlier based on 2007 income, so you are receiving it now.