Intuit regularly improves QuickBooks and discontinues support for older versions. Generally speaking, Intuit introduces new versions in the fall of a calendar year. For example, in September 2008, Intuit introduced the QuickBooks 2009 series of products. During April or May of the following year, versions more than 2 steps away from the current version will be discontinued.
That means in May of 2009, QuickBooks 2006 was discontinued. After discontinuation, you can continue to use an older copy of QuickBooks, but you won’t have access to support or business services such as payroll or online banking. To continue to use those services, you’ll need to upgrade to a supported version. Intuit posts the specifics of its QuickBooks service discontinuation policy online.
If you need to upgrade your copy of QuickBooks to continue to receive support or access to services, you can purchase QuickBooks at a discount (including download or delivery with free shipping) by accessing one of the links at our Buy QuickBooks page.