As you know, Microsoft Office 2007 launched for Business customers through Volume Licensing in November of 2006 and went to general availability through Retail Box and OEM in January of 2007. As such, now is a great time to educate your customers on the benefits and features of the 2007 Microsoft Office system.
After June 30, 2007, OEM Microsoft Office 2003 will no longer be available from Microsoft. Some authorized OEM Microsoft distributors may have some remaining inventory left for a short time after June 30th; however, Microsoft will no longer be shipping OEM Microsoft Office to them. For all system builders, you can see more about this on the Microsoft System Builder website.
Source : Microsoft Small Business Community Blog