When you work with a client's company file, the client must be using a
compatible version of QuickBooks. In general, versions of QuickBooks released
in the same year are compatible with each other. For example, QuickBooks
Premier 2006 and Pro 2006 are compatible with each other and with
QuickBooks Premier 2006: Accountant Edition.
Occasionally, an update patch affects compatibility for QuickBooks versions
released in the same year. When that happens, your clients must have the
current update patch in addition to the current year's release of
To learn about the latest QuickBooks update patches, go to the Help
menu and click Update QuickBooks.