A Sale's never dead until you see your competitor installing it.
Recently I sent out an email blast to let people know I disconnected the toll free number. This blast went out to everyone and anyone who has ever requested an estimate from me. I automatically add them to my mailing list. (They have the option to remove themselves). From this blast several estimates I wrote in the past have contacted me about doing the work. The blast went out last week, and today an estimate I wrote in 2006 wants the work done plus, another whom we did work for in 2007 wants more work.
I am going to have my assistant doing re-hash phone calls on old estimates going back to the very first estimte I ever wrote. It'll be boring but I am promising him 3% of what ever he can re-hash. Point being you never know what you can be missing, half the work is done if you already did the measurements and wrote the estimate. It reminds me of what made me so successful when I was a full time employee for another company. Contantly staying in touch with my prospects.