Funny you could find outlook solutions in a Thunderbird exclusive forum. But regardless the security used by Thunderbird and outlook is the same in this instance. The most common cause of this is anti virus programs that think they should scan encrypted mail streams and totally mess up your certificates as they are hacking you to get at your mail.

What anti virus do you use?

@Matt I use microsoft security essentials and malwarebytes.

"You are about to override how Thunderbird identifies this site"

Please post a screenshot of the error message. https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem

I don't know how to make the message appear, so I can't give you the exact image. Here is an example from another email client. The verbage is similar to mine except the url is something like twc.rr.server.com.

Just a guess, but perhaps you could try using the servers names recommended by your mail provider instead of the old RR ones. Lots of RR customers in the forums recently complaining avout various issues. ALL of them have not updated their server settings to those recommended by Time Warner.

See https://www.timewarnercable.com/en/support/faqs/faqs-internet/e-mailacco/incoming-outgoing-server-addresses.html

I followed the instructions in the article you cited.

Server Settings Change Server Name to POP3 port: 995 That is, in the Server Name field I typed POP3 and in the Port field, I typed 995

When I click Get Messages TB says "Failed to connect to POP3 server"

I wonder if I need to change a password?

Now I suggest you go back to the page I linked to and have a look at the server name they offer for you to use. In all cases it is given as mail.twc.com. I have no idea why you would choose a server name that does not exist, instead of the one in the article, but you have.

"I have no idea why you would choose a server name that does not exist, "

I know nothing about these things. I didn't know it does not exist. I apologize. 

I changed it to mail.twc.com 587. Now I get

mail.twc.com on port 995 is what the web page says. So try port 995

with Server Name mail.twc.com port: 995 I get connected to mail.twc.com (at bottom of Inbox screen) then connection to mail.twc.com timed out

Please add the troubleshooting information to your post To find the Troubleshooting information:

• Open Help (or click on three-line-icon and select Help)
• Choose Troubleshooting Information
• Use the button Copy to clipboard to select all. Do not check box "Include account names"!
• Paste this in your post.

Please also add the result of these troubleshooting steps to your post

• Does Thunderbird work in TB Safe mode (see Thunderbird Safe Mode)?
• Do you use anti-virus and firewall software? What is the version?

My first post was too big. I'm resending in two parts. This is the first resend. Thunderbird troubleshooting, safe mode

Please add the troubleshooting information to your post To

find the Troubleshooting information:

   Open Help (or click on three-line-icon and select Help)
   Choose Troubleshooting Information
   Use the button Copy to clipboard to select all. Do not 

check box "Include account names"!

   Paste this in your post.

Please also add the result of these troubleshooting steps to

your post

   Does Thunderbird work in TB Safe mode (see Thunderbird 

Safe Mode)?

   Do you use anti-virus and firewall software? What is the 

version?

TROUBLESHOOTING INFORMATION

 Application Basics

   Name: Thunderbird
   Version: 52.5.0
   User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) 

Gecko/20100101 Thunderbird/52.5.0

   Profile Folder: Open Folder

             (Local drive)
   Application Build ID: 20171121193617
   Enabled Plugins: about:plugins
   Build Configuration: about:buildconfig
   Memory Use: about:memory
   Profiles: about:profiles

 Mail and News Accounts
   account1:
     INCOMING: account1, , (pop3) mail.twc.com:995, SSL, 

passwordCleartext

     OUTGOING: , smtp-server.insight.rr.com:25, plain, 

passwordCleartext, true

   account2:
     INCOMING: account2, , (none) Local Folders, plain, 

passwordCleartext

   account4:
     INCOMING: account4, , (pop3) mail.twc.com:995, plain, 

passwordCleartext

     OUTGOING: , smtp-server.insight.rr.com:25, plain, 

passwordCleartext, true

 Crash Reports
   https://crash-stats.mozilla.com/report/index/bp-38b27962-

ec29-49c9-8169-f38a10171014 (10/14/2017)

   https://crash-stats.mozilla.com/report/index/bp-e9490694-

2a4e-47c0-a32a-f806d2160611 (6/11/2016)

   https://crash-stats.mozilla.com/report/index/bp-4720d4ef-

95cf-45cf-8a89-bbde52150921 (9/21/2015)

   https://crash-stats.mozilla.com/report/index/bp-4daa1b71-

495f-4d30-970a-dbf7e2150921 (9/21/2015)

   https://crash-stats.mozilla.com/report/index/bp-f54f9ce8-

f0d8-42b3-bed1-8ee922140219 (2/19/2014)

 Extensions
   FiltaQuilla, 1.3.2, true, [email protected]
   Lightning, 5.4.5, true, {e2fda1a4-762b-4020-b5ad-

a41df1933103}

   MoreFunctionsForAddressBook, 1.0b3, true, {3e17310d-82e8-

4a43-bd2f-7c3055bfe589}

   Nostalgy, 0.2.34, true, [email protected]
   Recover deleted messages, 0.4, true, {8380f54c-9b7a-4107-

b703-9b938e30fb54}

   Remove Duplicate Messages, 0.1.14, true, {12345678-1234-

1234-1234-123456789abc}

 Important Modified Preferences

   Name: Value

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     browser.cache.disk.filesystem_reported: 1
     browser.cache.disk.smart_size_cached_value: 358400
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     browser.cache.disk.smart_size.use_old_max: false
     dom.apps.reset-permissions: true
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     gfx.crash-guard.glcontext.gfx.driver-init.webgl-angle: 

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     gfx.crash-guard.glcontext.gfx.driver-init.webgl-angle-

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     gfx.crash-guard.glcontext.gfx.driver-init.webgl-angle-

force-warp: false

     gfx.crash-guard.glcontext.gfx.driver-init.webgl-angle-

try-d3d11: true

     gfx.crash-guard.status.glcontext: 2
     gfx.direct3d.last_used_feature_level_idx: 1
     mail.openMessageBehavior.version: 1
     mail.winsearch.enable: true
     mail.winsearch.firstRunDone: true
     mail.winsearch.global_reindex_time: 1314206108
     mailnews.database.global.datastore.id: 5fb804db-1574-

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     mailnews.database.global.views.conversation.columns: 

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     print.printer_\\JAN-PC

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This is the 2nd resend. print.printer_\\JAN-PC

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     print.printer_\\JAN-PC

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false

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false

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print.printer_EPSON_NX125_NX127_Series.print_edge_bottom: 0

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print.printer_EPSON_NX125_NX127_Series.print_footercenter:

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print.printer_EPSON_NX125_NX127_Series.print_margin_bottom:

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     security.sandbox.content.tempDirSuffix: {5cde54d8-8f43-

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 Graphics

     GPU #1
     Description: Intel(R) HD Graphics
     Vendor ID: 0x8086
     Device ID: 0x0042
     RAM: Unknown
     Drivers: igdumd64 igd10umd64 igdumdx32 igd10umd32
     Driver Version: 8.15.10.2622
     Driver Date: 1-10-2012

     Features
     Direct2D: false
     DirectWrite: true (6.2.9200.22164)
     WebGL Renderer: Google Inc. -- ANGLE (Intel(R) HD 

Graphics Direct3D9Ex vs_3_0 ps_3_0) -- OpenGL ES 2.0 (ANGLE

2.1.0.2a250c8a0e15)

     AzureCanvasBackend: skia
     AzureCanvasAccelerated: 0
     AzureFallbackCanvasBackend: cairo
     AzureContentBackend: skia

 JavaScript

 Incremental GC: 1

 Accessibility

   Activated: 0
   Prevent Accessibility: 0

 Library Versions

     Expected minimum version
     Version in use

     NSPR
     4.13.1
     4.13.1

     NSS
     3.28.6
     3.28.6

     NSS Util
     3.28.6
     3.28.6

     NSS SSL
     3.28.6
     3.28.6

     NSS S/MIME
     3.28.6
     3.28.6

TROUBLESHOOTING STEPS

TB Safe Mode

All add-ons have been disabled by safe mode.

In Safe Mode (still with Server Name mail.twc.com port: 995) I get connected to mail.twc.com (at bottom of Inbox screen) then connection to mail.twc.com timed out