I had a Gmail account 'x@gmail.com' with ~2000 messages, and I wanted to move all of these to a new account 'y@gmail.com' so that I could empty x@gmail.com.
I set them both up in Outlook 2010 and made sure they were both synced with Outlook's data files properly. Then (within the Outlook environment), I dragged the all mail folder from x@gmail.com to y@gmail.com. A progress bar/dialogue came up and it proceeded to copy things. After about an hour and 75% through the progress bar it stopped with an error message (which I can't remember).
Now when I look in x@gmail.com via browser interface it's completely empty, and y@gmail.com only has 30 of the emails. If I access y@gmail.com via Outlook, I can view all ~2000 emails, so they're obviously in the data file on my PC. But it won't sync them with the actual Gmail account. The progress bar at the bottom finishes and there are still only 30 emails in y@gmail.com. How do I get them all in there?
Also, when I look at the Outlook data file directory via Windows, there are two data files for x@gmail.com: 'x@gmail.com' and 'x@gmail.com(2)'. The former is 260Kb and the latter is 300Mb. Why are there two?