Back in November, before we all got our ArcGIS 9.2, ESRI posted an updated ArcGIS Desktop Life Cycle PDF that showed that ArcGIS 9.1 had entered “Extended Support”. I guess they changed their minds because it appears that 9.1 is still in “General Availability”. We are back to the:

ArcGIS 9.1 will be moved to Extended support 3 months after ArcGIS 9.2 begins shipping.

which means that if ESRI says 9.2 shipped “mid-November” then 9.1 will transition to Extended Support mid-February. I don’t recall ever seeing ESRI repost this, but that doesn’t mean that 9.1 or even 9.2 will be certified to work with Microsoft Vista.

ESRI does not currently support ArcGIS products on Windows Vista and does not have plans to add Vista support to ArcGIS product versions up to and including 9.2. However, ESRI is committed to supporting ArcGIS on the Windows Vista operating system and intends to add support for Windows Vista in service packs released after ArcGIS 9.2 Service Pack 2, as well as future releases of ArcGIS products.

So 9.2 will be certified down the road, but 9.1 will not. ArcGIS 9.1 is in General Availability at the time of the Microsoft Vista release and I guess that doesn’t mean that ESRI will support it.

I've scratched my head so much over ESRI that I'm going bald