Did you not register your software? If you did, Adobe would have a record of it.
If I remember correctly, it was a group of six 4-digit numbers: NNNN NNNN NNNN NNNN NNNN NNNN.
Another serial number question. Can I download and install the current tryout version of PM, and use my old serial number from a PM 7 upgrade I registered with Adobe in 2002? Yes, I got the S/N from them (thank you Adobe!), and yes, it is 24 digits.
I need to convert some old PageMaker files to InDesign, and because they contain non-Unicode characters I need to do some preliminary processing in PM, preferably on my ol' reliable WinXP machine. (I think I installed my PM 7 upgrade on a Win98 machine that I haven't turned on in years). I found my original disks for Aldus PM 5 and Adobe PM6.5, but turning up those for PM7 looks more challenging.
I figured it out, with the help of a friend with 6.5. I studied his SN for clues. There IS a dash then 3 numbers at the end. Using photoshop to superimpose possible numbers and letters over the silverfish-eaten spots, and after going through multiple combinations, I finally hit pay dirt. This time I saved the SN in a couple different ways.