In Gmail, when I click on View Labels, I get a list of all the malboxes I have. Under Inbox and Sent there's a line that says: Sync 4 days. Under Drafts, it says: Sync all. What are these different sync notations all about? Where do they mean? Do things get synced in 4-day stretches? I never configured these settings, so is this the default? And where do I make changes? Many thanks in advance!