QuickBooks 2003 CD disk. It runs only on Windows only (not MACS). Its ideal if you want to have a version of quickbooks which you can create multiple client accounts on.

But please note - QuickBooks now has a much newer option of its software (see QuickBooks.com) - and 2013 is now available. And the latest versions of QuickBooks have a lot more functions e.g. multi-currency, however this is still an excellent edition of the software and surfice for keeping your clients accounts.