I'm in the process of moving my email to Gmail. I used to use Outlook and I have a massive amount of email stored in various PST files (about 7GB worth). Ultimately I'd like to store this all in Gmail so I have my entire email archive available.

I imported my first PST file using Outlook's IMAP feature - dragging the folders in one by one. This worked, but was quite slow and laborious (since I had to check on it every few minutes and set the next folder going).

Is there any way I can do the import - either without using Outlook, or by somehow just setting it to go and leaving it overnight without any intervention?

I did look at using Google Sync for Outlook, but it looks like this will also pull down all of the email I've already uploaded, which ideally I'd like to avoid (although if this is the only option I'll do that!)