I set up a filter to forward everything from my old google mail account to my new google apps mail. First had it set up to forward everything new and archive - works perfectly, so changed it from archive to delete.
Then set it up to copy everything already there to the new account - couldn't manage it with a filter so just selected everything and forwarded. Then deleted everything once I had checked it worked.
Very odd, but the workaround wasn't too onerous.
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Rory
MkIIa, blue lit buttons, memory upgrade, 1Tb in Subaru Forester STi
MkII, 240Gb in Mark Lord dock
MkII, 80Gb SSD in dock