OneDrive, Microsoft's file sync app formerly known as SkyDrive, lets you store your files online, edit Office documents in the free Office Web Apps, and easily access your online files from your PC.
Put campaign requirements beside assets awaiting review.
Your reviewers see the brief beside the asset, with the brand decision they need to make clearly stated.
Put the current creative file in the campaign sign-off task.
Your brand reviewer gets the current campaign draft and the decision needed together on the review task.