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netmeg - 8:20 pm on Jan 29, 2009 (gmt 0)
How is that different? I haven't seen it posted on the official AdWords blog, and we can't quote emails or post links here, but you'll find something about it on ewhisper's blog, if you consider him to be authoritative.
However, you cannot have xyz.com and xyz2.com in the same ad group. That is very different from saying that an advertiser will not be allowed to test Example.com against Example1.com in the same ad group. I want to see this from an official source!