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I upgraded to Windows 10 and have lost all my contacts

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Upgraded to windows 10 and have lost all my contacts for the last 4 years. How can I get them back?

Upgraded to windows 10 and have lost all my contacts for the last 4 years. How can I get them back?

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Where were they stored? In which program? What have you done to import or restore settings and data from before you switched to Windows 10?