when you close the Skype window in Windows7, its icon will still appear in your taskbar.If you look this unnecessary, you can remove this by following tutorial.
1. Launch SKYPE login with your login id and password.
2. Go to Tools > Options
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3. Now click on advanced tab.
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4. Now uncheck the “Keep Skype in the Taskbar while I’m signed in on the right side of the window”.
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5. Now save your settings and Enjoy.