In the search box - type Windows Mail (probably windows live mail) and you should then find it. Assume that it is still your default email client.
When you state "vanished", vanished from where? Where do you normally click to open it?
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Synology invite you to their launch event on 16th September 2015. See the unveiling of the new DSM and products live, plus a chance to win a populated NAS! Tickets are free and available now. Click HERE for more details