I got this from the MS knowledge base:

Starting with Microsoft Data Access Components (MDAC) version 2.6, MDAC no longer contains the following Jet components:
Microsoft Jet
Microsoft Jet OLE DB Provider
ODBC Desktop Database Drivers
For additional information, click the article number below to view the article in the Microsoft Knowledge Base:
Q239114 ACC2000: Updated Version of Microsoft Jet 4.0 Available in Download Center
The "MDAC 2.5 Stack and Windows File Protection" white paper contains a full list of the components that are shipped with MDAC 2.5, along with a discussion of Windows File Protection. Refer to this white paper for more information about the Jet dynamic-link libraries (DLLs) that are included in MDAC 2.5, which are no longer a part of MDAC 2.6.

For more information about MDAC 2.5 and Windows File Protection, see the following Microsoft Web site:
http://www.microsoft.com/data/mdacwfp.htm



Of course that does not mean Jet has not also been removed from SP5. Where did you get that piece of info?

regards,

Helger