Which mailbox software you are using? if you use Windows Live Mail, refer to this link for help.
(SOLVED) All contacts in Windows Live Mail are gone or not syncing
http://technicalforum.org/how-tos/solved-all-contacts-windows-live-mail-are-gone-or-not-syncing
if you use Outlook as email software, refer to this article for help
https://lookeen.com/blog/what-to-do-when-your-contacts-are-missing-in-outlook
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