Viewing data usage
When a network is set to show data usage you'll see the estimated usage (in MBs or GBs) on the network list after you select that particular network name. And with the improved Task Manager Microsoft introduced in Windows 8, you can view the estimated data usage of particular applications as well. When a network is set as a metered connection it can limit some non-critical downloads and Internet activity to help reduce data usage. For instance when enabled Windows Update won't download updates (except for critical security patches) and third-party apps won't download or transfer unnecessary data either.