Thank you kindly for response Diane. I am not sure if I understand correctly - "did you delete the imap account?"
I had my email accounts setup as pop and I deleted these pop accounts in order to add them back as imap.
In an effort to access all email accounts via all devices (W10 PC + Laptop plus Android phone + tablet), I changed all from POP3 to IMAP. Now it seems all my contacts are gone! Disastrous for my small 15 year old business. Where have I gone wrong? TIA, Eileen