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Why does the Marketplace icon have a number next to it on my Samsung Windows 8 Phone?
From time to time, your Store icon will show a number next to the bag image. This indicates you have new application updates waiting to be installed on your phone.
Tap the Store icon and then tap "X" updates at the bottom of the screen. X refers to the number of applications that have updates awaiting. Tap update all and your phone will download the app updates from the Marketplace and install them. You can tap each application and tap update to update only that app.