Hi, Kaplan.
I never heard of "an (OEM) Quicken Deluxe 2006". What exactly are you getting? And you ordered it from WHERE?
It IS possible to run two versions of Quicken on one computer, but it generally is not recommended. You CANNOT share a single data file between two versions, especially not versions as far apart as 1999 and 2006.
If you really want to do this, then just be SURE your '99 data is backed up (in the '99 format) and that your '99 program files are protected from being overwritten - or that you have media so that you can re-install '99 if things go badly. Then install 2006, pointing it to a new location. After installation, tell Q06 to Open your old .qdf file, then Save that to the new location of your choice. Run Q06 and make sure you like it. Until you decide to retire Q99, you'll need to continue to duplicate all your new transaction entries there, as well as in Q06.
RC