Actually they are trying to use the email to show that Google were knowingly breaching the license, not that google knew ahead of time that they were in the wrong.
I don't think I understand the subtle difference in what I said and what you said... So let me try to be clear by pretending to know what I'm talking about for a second: Oracle is trying to use the e-mail to show evidence of WILLFUL INFRINGEMENT.
And it could be evidence of that, except: 1) it was written after Oracle started threatening, 2) it was written AFTER Sun's CEO publicly congratulated Google on releasing Android and promised Sun would support the Android platform 3) it was written by someone in Google not working on Android 4) it was saved as a draft but not sent.
Oracle are dicks, but that is only a mild improvement on the twats that are google.
Are you trying to say Oracle is less evil than Google? Are you at all familiar with Oracle?
Honestly even if Google is in the wrong here (which I strongly disagree with), I think it's vitally important Oracle lose this case, as the legal theory they are trying to push (that public APIs are subject to copyright and licensing) is absolute INSANITY and would be the death knell to a large percentage of the software industry.
Though it would make developing on proprietary systems significantly more painful than Free/Open systems like Linux, so that would make some people around here very happy...