I recently started having this problem with Zimbra Desktop where none of my accounts will sync. I have 8 accounts - gmail, yahoo mail, Live, and exchange - and none of them can reach their servers. All of them have the red "offline" square. I have verified internet connectivity (I can see each account in its own web-based counterpart). When I try to "validate and save", the error is always something like "Cannot connect to 'zimbra.imap.mail.yahoo.com:993'. Please check host/port and network connectivity." I have verified that nslookup zimbra.imap.mail.yahoo.com does resolve and I can ping zimbra.imap.mail.yahoo.com. I upgraded to Windows 7 about a week ago and Zimbra worked for 3 or 4 days afterward and only stopped 2 days ago. I am using version 1.0.3 build 1691. Any idea what could be wrong and how can I fix this?