Stack says most of us are drowning in e-mails and too often use our inboxes like to-do lists. Digital clutter can be just as stressful and energy-sapping as physical clutter, she says. Stack suggests organizing your inbox similar to your paper files, either with folders or with task functions built into the software. For example, rather than flagging an email unsystematically, use Outlook or Entourage commands to set a reminder to follow up. More From Forbes: 20 Careers Headed for the Dustbin Top Tips to Improve Your Money Can Body Language Cost You a Promotion? The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.