answer:I would be remiss to not suggest first turning your PC, Router, Modem (everything) all the way off and starting them back up in order – just to make sure it’s not a hiccup there. However, this happened to me one time when my network provider changed network settings. It happened another time when another email account changed server settings. If the problem does not fix itself in a few hours, try this from Outlook to debug the problem and contact your providers to see what the new settings are. This is from Outlook 2003, but you may have very similar options for later versions. - Tools – Email accounts – View or change existing – Next – Change – Test Account Settings The errors tab will provide detail for errors encountered. This is also where you would make network setting adjustments.