Below are the changes that will take place on March 9th. If you are already protected by the Steam Guard Mobile Authenticator (or if you add the security feature to your account today), the first two points below will not impact you:

• Trade hold duration will be increased to 15 days (for long-time Steam friends the duration will remain 1 day)
• Listing on the Steam Community Market will have a hold of 15 days before an item can be sold
• Steam Support will no longer restore items that have left accounts following a successful trade or market transaction (a process that previously created duplicates of original items)