In accordance with our 
policy of sunsetting older versions of the AdWords API, we will turn off access to version 11 of the API on 
Tuesday, August 26, 2008. Version 12 of the API has been available for over four months now, and s
upports a number of 
new features. We hope that you've already taken the opportunity to upgrade your code. 
The latest versions of the publicly available 
client libraries all support version 12 of the API, so if you're using one of those, please check the relevant 
README file for information on how to switch from version 11 to 12. The migration process should be fairly straightforward, but one thing in particular to watch out for is that 
ad group ids are no longer 
ints; they're now 
longs in version 12.
As always, if you have any questions about the AdWords API or upgrading to our latest versions, you can check out our 
Frequently Asked Questions or ask them in our 
developer forum.
Cheers,
-Jeffrey Posnick, AdWords API Team