This seldom used XP PC using Outlook Express has been using this Zoho email account for years with no problems. It just started getting this error when sending and receiving email. Nothing has been changed, upgraded, etc. No change with completely disabled AV. Any ideas what instantaneously changed? The account works fine on my Windows 7 PC with Thunderbird. It uses the same settings. The error follows:

(POP) Your server has unexpectedly terminated the connection. Possible causes for this include server problems, network problems, or a long period of inactivity. Account: 'ZohoZ', Server: 'popold.zoho.com', Protocol: POP3, Port: 995, Secure(SSL): Yes, Error Number: 0x800CCC0F