Well, Excel 2010 is still in Beta so its still a work in progress ...
The C API has been extended in Excel 2010 to allow for 64-bit and
asynchronous UDFs etc.

So the C API has been extended in both XL2007 and 2010: does not sound like
its going to go away any time soon.

Charles
___________________________________
The Excel Calculation Site
http://www.decisionmodels.com

"johnlon" wrote in message
...
thanks

You mean the api's already exist and have been certified as compatible by
MS?
IS this documented my MS somewhere?


"Charles Williams" wrote:

It is supported by Office 2010 for both 32-bit and 64-bit Excel 2010
(with
corresponding Vista/Windows 7 versions)


Charles
___________________________________
The Excel Calculation Site
http://www.decisionmodels.com

"johnlon" wrote in message
...
Is there a published roadmap for the Excel C API.

Will it be supported in Office 2010?
What about Windows 7?

Thanks