How to sync all Gmail with iPod touch?
If you add your Google account as an Exchange account you can theoretically sync an unlimited amount of Email on your device. To do this, follow the instructions at Google to use Google Sync with Gmail (http://www.google.com/support/mobile/bin/answer.py?hl=en&amp;answer=138740) and after that change the option "Mail Days to Sync" to "No Limit". The Option "Show XX Recent Messages" will be ignored (this is actually intended behavior, see http://support.apple.com/kb/HT2723).