On 9-7-13 I was sending and receiving emails successfully with Outlook 2007 on Windows 7 platform.  Then all of a sudden emails were not leaving my outbox.  I went to the 2 other computers I have (1 laptop top on Windows 7 and a desktop still on Windows XP) and tried sending emails from those computers and could not.  FYI... None of these computers are network.   I also tested all of my email accounts (we have 4 in our household) and no emails are going out from ANY of my email accounts on any computer.   

I went to the Account Settings in Outlook 2007 and ran the TEST ACCOUNT SETTING wizard and here are the results...

The 2 Laptops on Windows 7 have this error message...."The server responded: 421 Too many connections
The 1 Desktop on Windows XP has this error message... "An unknown error occurred, error code: 0x800ccc67

So I contacted my ISP (Road Runner with Time Warner Cable) and verified that there was not a connection issue on their side.   There was not.   I can send and receive emails with my road runner web mail which proves there servers and service is working just fine and the  issue is NOT with my ISP.  We also verified that my Pop3 and SMTP protocols were still correct on all accounts and they are.    So,  since the issue is not with  TWC issue they told me to contact Microsoft.  Hold time with Microsoft was so long I gave up!!!!

I'm stumped at how to fix this and why it happened on all 3 computers simultaneously.  Some internet suggestions were that there might be an issue with Anti virus programs and to disable the email scans.  So on the Desktop (windows XP system)  I disabled the email scanning on the Norton 360 and  I also Uninstalled System Mechanic Professional.  I rebooted and tried again.  No luck,  still can't send emails and I still get the same error message when run a Test Account Settings.     Anyone got  any ideas.?   Many of the threads on the internet had suggestions that were way outside my technical level and way over my head.   Before I pay to have a tech look at 3 computers (very costly) I was hoping this community could help.