[IGGUS]

Go to your Inbox, where you can see all your emails in front of you. Then bottom left click Menu>Tools>Manage Folders

Once in there you should be able to hit a checkbox next to whichever folders you want other than those it syncs by default. It will then download them during the next sync with whatever download settings you've set for the entire account.

Watch out if you have any rules set up for new emails. Sometimes you'll get a new email indicator and just can't find it in your inbox, to later stumble upon it in one of your newly synced folders.