I lost all of my contacts and folders. Is there a way to retrieve them?

I had my computer in the shop for recently to clear some viruses and malware and EM client was inadvertently erased. I was able to retrieve my emails, but lost all of my contacts and folders. is there a way to retrieve them?

If they deleted your database directory, all local folder data would have been erased. The only option is for you to restore from your most recent backup.