Have you updated your computer lately? If you've had a PC for any length of time, then you know that every month Microsoft issues a set of updates on "Update Tuesday" to patch security holes and bugs to make your computer experience as smooth and secure as possible.
However, Microsoft has pulled one of the most recent updates from Update Tuesday last week, and it was an important fix. A security hole in Exchange, a business program, allowed hackers to swipe login tokens and send emails in their name.
That means that crooks can steal information from you to send you spoofed emails to steal information from customers. It's not the first time this particular security hole has been patched, either.
This patch was included in the November 2014 Update Tuesday, but was pulled just before the update went live. It was worked on to be released in time for the December 2014 Update Tuesday, but the new snag has caused it to stop Outlook from working with Exchange.