What does that mean? Thunderbird does not start? You can not install it? Windows lost your profile in the upgrade (common) and there is no mail or accounts installed after update?

Your account is with a mail provider. be it your ISP or one of the others like Hotmail and Yahoo. Are you seeing error messages? what might they be?

Thanks for your response.

T-bird loads and starts, but when asked for pass word to my Gmail account I enter it and it just keeps asking for the pass word. It never connects and just shows the last emails before up grading to WIN 10. I can get into my Gmail account on line and with other, I consider junkie, email handlers. T-bird is the greatest.

I do not get any error messages, just the same request for password.

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.

Matt said

What does that mean? Thunderbird does not start? You can not install it? Windows lost your profile in the upgrade (common) and there is no mail or accounts installed after update? Your account is with a mail provider. be it your ISP or one of the others like Hotmail and Yahoo. Are you seeing error messages? what might they be?

Thanks for your response.

T-bird loads and starts, but when asked for pass word to my Gmail account I enter it and it just keeps asking for the pass word. It never connects and just shows the last emails before up grading to WIN 10. I can get into my Gmail account on line and with other, I consider junkie, email handlers. T-bird is the greatest.

I do not get any error messages, just the same request for password.

Lets have look at your settings. 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.

I hope this helps and you didn't need a lot of printer info that I had to delete.

T-bird 'Troubleshooting info'

 Application Basics

   Name: Thunderbird
   Version: 45.5.1
   User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1
   Profile Folder: Show Folder

             (Local drive)
   Application Build ID: 20161130024037
   Enabled Plugins: about:plugins
   Build Configuration: about:buildconfig
   Memory Use: about:memory

 Mail and News Accounts
   account1:
     INCOMING: account1, , (imap) imap.googlemail.com:993, SSL, passwordCleartext
     OUTGOING: , smtp.googlemail.com:465, SSL, passwordCleartext, true

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

 Crash Reports
   http://crash-stats.mozilla.com/report/index/bp-6a4241b0-e9fd-43b1-b0cf-70ed12160418 (4/18/2016)
   http://crash-stats.mozilla.com/report/index/bp-745f3f05-0d4c-469e-83d6-8d4b62160407 (4/6/2016)
   http://crash-stats.mozilla.com/report/index/bp-d3cff4e2-04e9-40a6-a2c0-fb3462160407 (4/6/2016)

 Extensions
   Lightning, 4.7.5.1, true, {e2fda1a4-762b-4020-b5ad-a41df1933103}

 Important Modified Preferences

   Name: Value

     browser.cache.disk.capacity: 358400
     browser.cache.disk.filesystem_reported: 1
     browser.cache.disk.smart_size_cached_value: 358400
     browser.cache.disk.smart_size.first_run: false
     browser.cache.disk.smart_size.use_old_max: false
     dom.apps.reset-permissions: true
     extensions.lastAppVersion: 45.5.1
     font.internaluseonly.changed: true
     font.name.monospace.el: Consolas
     font.name.monospace.tr: Consolas
     font.name.monospace.x-baltic: Consolas
     font.name.monospace.x-central-euro: Consolas
     font.name.monospace.x-cyrillic: Consolas
     font.name.monospace.x-unicode: Consolas
     font.name.monospace.x-western: Consolas
     font.name.sans-serif.el: Calibri
     font.name.sans-serif.tr: Calibri
     font.name.sans-serif.x-baltic: Calibri
     font.name.sans-serif.x-central-euro: Calibri
     font.name.sans-serif.x-cyrillic: Calibri
     font.name.sans-serif.x-unicode: Calibri
     font.name.sans-serif.x-western: Calibri
     font.name.serif.el: Cambria
     font.name.serif.tr: Cambria
     font.name.serif.x-baltic: Cambria
     font.name.serif.x-central-euro: Cambria
     font.name.serif.x-cyrillic: Cambria
     font.name.serif.x-unicode: Cambria
     font.name.serif.x-western: Cambria
     font.size.fixed.el: 14
     font.size.fixed.tr: 14
     font.size.fixed.x-baltic: 14
     font.size.fixed.x-central-euro: 14
     font.size.fixed.x-cyrillic: 14
     font.size.fixed.x-unicode: 14
     font.size.fixed.x-western: 14
     font.size.variable.el: 17
     font.size.variable.tr: 17
     font.size.variable.x-baltic: 17
     font.size.variable.x-central-euro: 17
     font.size.variable.x-cyrillic: 17
     font.size.variable.x-unicode: 17
     font.size.variable.x-western: 17
     gfx.direct3d.last_used_feature_level_idx: 0
     mail.openMessageBehavior.version: 1
     mail.winsearch.enable: true
     mail.winsearch.firstRunDone: true
     mail.winsearch.global_reindex_time: 1396046452
     mailnews.database.global.datastore.id: 943e32bf-7859-4112-88a0-17aea17f9fd
     network.cookie.prefsMigrated: true
     network.predictor.cleaned-up: true
     places.database.lastMaintenance: 1460003062
     places.history.expiration.transient_current_max_pages: 104858
     plugin.importedState: true
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_bgcolor: false
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_bgimages: false
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_colorspace:
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_command:
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_downloadfonts: false
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_duplex: 0
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_edge_bottom: 0
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_edge_left: 0
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_edge_right: 0
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_edge_top: 0
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_evenpages: true
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_footercenter:
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_footerleft: &PT
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_footerright: &D
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_headercenter:
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_headerleft: &T
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_headerright: &U
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_in_color: true
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_margin_bottom: 0.5
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_margin_left: 0.5
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_margin_right: 0.5
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_margin_top: 0.5
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_oddpages: true
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_orientation: 0
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_page_delay: 50
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_paper_data: 1
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_paper_height: 11.00
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_paper_name:
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_paper_size_type: 0
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_paper_size_unit: 0
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_paper_width: 8.50
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_plex_name:
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_resolution: 0
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_resolution_name:
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_reversed: false
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_scaling: 1.00
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_shrink_to_fit: true
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_to_file: false
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_unwriteable_margin_bottom: 0
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_unwriteable_margin_left: 0
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_unwriteable_margin_right: 0
     print.printer_HP_Officejet_4500_G510n-z_(Copy_1).print_unwriteable_margin_top: 0
     print.printer_PDF_Complete.print_bgcolor: false

those settings look good for gmail, however there are others that are probably better.

Right click the account in the folder pane, select settings. Change the authentication method to oAuth2.0 That setting bypasses some other security junk on the gmail site and might work better.

Sorry to take so long getting back to you on this. During all this work I discovered my desktop wasn't getting updated automatically like my Win10 Laptop. So I figured something deeper was the problem. I had my computer reformatted with Windows 10 and have been enjoying reloading everything. Tbird now works GREAT! Thank you for your help..