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Microsoft has posted a reminder that Windows Phone 7.8 will lose its mainstream support on September 9



From WPCentral:
That means that after September 9, phones that have Windows Phone 7.8 won't be getting any more new operating system features or major performance improvements. However, those same phones will still receive free security updates for the next five years. Most people will likely purchase an all new phone with Windows Phone 8.1 installed rather than continuing to use their old device for the next five years.
  Windows Phone 7.8 mainstream support ends September 9