TB = Thunderbird.

user may also need to Disable AV/FW/SS software, OR enable+add+allow EXCEPTIONS in it . some AV/SS creates insecure proxy/gateway for scanning/checking emails, but there are other secure way to scan/check emails. when above step(s) (shown inside linked page) is/are done, then in updated TB, email may begin to work, but that will not bring older address-book back.

v68 series uses mork format based mab files to store address book. see if any tools here can help you to convert the mab into csv, etc format , then you can import those into newer TB. another way, is to go back to older TB, by downgrading ( from v78 series TB (profile) into v68 series TB(profile) ) , then you can fix Address-Book, make it simpler, that is: add multiple entry if necessary but remove special columns/fields, etc , then if you want to upgrade back to v78 series that will probably work. in v68 series you can export contacts into csv,etc file. & bring/import that into v78 series TB.

you MUST first make backup/copy of ALL TB PROFILES here: "%APPDATA%\Thunderbird\Profiles\" thats usually located here: "C:\Users\<YourWindowsUserName>\AppData\Roaming\Thunderbird\Profiles\"

in Windows, users who wants to Regain older TB data ( various options : downgrade to regain data , or use a second-TB to regain data , or transfer specific files/data from TB-profile backup, etc. ) in macOS, you may see info on downgrade TB , downgrade by using second-TB , upgrade TB.

user may Disabled auto-update of TB (please upvote my Q+A inside linked page, if its useful/helpful)

ATT-Yahoo related settings for TB. Yahoo related settings for TB. Microsoft related settings for TB.

So you have done help > restart with add-ons disabled ? Please do help > troubleshooting > copy text to clipboard and paste the information here. Also in troubleshooting, go to about:profiles and do a screen shot of what you see there.

So you have done help > restart with add-ons disabled ? Yes

Please do help > troubleshooting > copy text to clipboard and paste the information here. Ensure this value has at most 10000 characters (it has 10156). Having trouble achieving this.

user:Wayne Mery instructed you to use those option(s)/command(s) inside the Thunderbird = TB , not Firefox.

you may have to delete earlier post, if they are not from TB.

you may see my earlier post, follow precautionary steps, then did you see/try any Address Book Converter Tools, that page is any helpful for you ? your address-book files, *.mab files, may have backup extension like this: *.mab.bak , so you have to get rid of .bak portion, & then try one of those tool.

OK, at this point I am thoroughly confused who I should deal with, what is required and what is not required. I have invested about 10 hours trying to resolve this issue and it appears to be something Mozilla did to me in Ver# 78.4.0 upgrade. I need a better roadmap on what I need to do to resolve issue and maybe a better communication means if large files are required.

So you have done help > restart with add-ons disabled ? Please do help > troubleshooting > copy text to clipboard and paste the information here. Also in troubleshooting, go to about:profiles and do a screen shot of what you see there.

These of course must be done in Thunderbird.

10 hours is way to much time to invest, I agree. Solutions that put you on that path of doing many steps, especially ones you don't understand, should be only used as a last resort.

I tend to find that gathering data on the situation, up front, before taking action tends to save time in the long run. This is what I am suggesting.

Wayne Mery

   Top 10 Contributor
   Moderator

I will try and only focus on your replies.

I do receive your emails but cannot reply to you with that since Thunderbird is not working. If you put 2 columns on a piece of paper and title on Incoming and the Other Outgoing Incoming works. I receive emails without problem. I cannot send emails or reply to received emails. My address-book does not work and/or is not existing. I agree it is in my profile but with a bak designation.

Next, please, rather than many steps with many options, which I have printed your suggestions, give me a step by step outline to follow, maybe steps 1-5 or something like that. If one of your steps does not work I will try one of your options.

Also, in the section, Post a Reply, I cannot paste my Trouble Shooting Information because it is too big, aka too many characters. Also, I have tied saving the file in another format (cut an paste) in smaller ideally more digestible bites but this is not working well either. I will try again with my About profiles, pasting an image but it did not work yesterday.

Thanks for you ongoing help Wayne.

About Profile

About Profile

congrats. and good news, only one profile.

The troubleshooting parts that are most relevant: Mail and News Accounts Add-ons Important Modified Preferences

To save a step, visit the "root folder" that you see in about profile. sort by "Type" or file type. What file names are listed for type .BAK files and .SQLITE do you have?

Important Modified Preferences Name Value accessibility.lastLoadDate 1527883212 accessibility.typeaheadfind.flashBar 0 browser.cache.disk.amount_written 851082 browser.cache.disk.capacity 1048576 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 browser.cache.disk.telemetry_report_ID 3 browser.search.region US dom.apps.reset-permissions true extensions.lastAppVersion 78.4.0 font.internaluseonly.changed false ... font.size.variable.x-western 17 gfx.crash-guard.d3d11layers.appVersion 78.4.0 gfx.crash-guard.d3d11layers.deviceID 0x1912 gfx.crash-guard.d3d11layers.driverVersion 25.20.100.6446 gfx.crash-guard.d3d11layers.feature-d2d true gfx.crash-guard.d3d11layers.feature-d3d11 true gfx.crash-guard.status.d3d11layers 2 idle.lastDailyNotification 1608642632 layers.mlgpu.sanity-test-failed false media.gmp.storage.version.observed 1 media.hardware-video-decoding.failed false network.cookie.prefsMigrated true network.predictor.cleaned-up true network.protocol-handler.warn-external.ftp true network.protocol-handler.warn-external.http true network.protocol-handler.warn-external.https true places.database.lastMaintenance 1608175839 places.history.expiration.transient_current_max_pages 100000 places.history.expiration.transient_optimal_database_size 85415034 ... security.disable_button.openCertManager false security.remote_settings.crlite_filters.checked 1604015540 security.remote_settings.intermediates.checked 1604015540 security.sandbox.content.tempDirSuffix {f8f7a099-606e-4a3a-bcfa-46054c43a605} security.sandbox.plugin.tempDirSuffix {ffe4a1df-f415-430b-8e13-5adacc0233fc} signon.importedFromSqlite true storage.vacuum.last.index 1 storage.vacuum.last.places.sqlite 1353546878 ui.osk.debug.keyboardDisplayReason IKPOS: Touch screen not found.

Wayne Mery, I await your directions to proceed.

I have a question though. I noticed that my posts do not get applied until the moderator approves them. In some cases I have duplicates. How do I delete duplicate entries. There is no delete button/option and if i edit -> delete message -> it will not allow me to save it. It looks for atleast 5 characters to save. Should I just put in "message deleted" to make the system happy?

Thank you.

I can handle the duplicates.

Still waiting for "Mail and News Accounts" and "Add-ons" from troubleshooting, and ...

in troubleshooting, in about:profile, click "open folder" for the "root directory" item. in that directory sort by "Type" or file type. What file names are listed for type .BAK files and .SQLITE do you have?

Mail and News Accounts

.BAK files

SQLITE files

Please check tools > addons > extensions. what addons are enabled? what addons are disabled?

No Addons

I tried doing a search on the Taskbar for Add-ons. The only thing that came up is Internet Explorer -> Programs -> Manage Add-ons but noting else.

Name Adobe PDF Reader Publisher Adobe Inc. Status Enabled Architecture 32-bit and 64-bit

... Name Norton Toolbar Publisher NortonLifeLock Inc. Status Enabled Architecture 32-bit and 64-bit

Name Norton Password Manager Publisher NortonLifeLock Inc. Status Enabled Architecture 32-bit and 64-bit

I was doing some research.

1. Tools > options > composition scroll down to Addressing try unchecking the boxes for Directory Server and restart. Any better? 2. Please do help > restart with add-ons disabled. 2a) Once started visit error console (ctrl+shift+J) and (ignoring lines with "L10nRegistry") what do you see there? 2b) Now open compose message, type a full correct address and hit tab - is the address red in color or shaded? visit error console again, anything new there since doing 2a? 3. If you can, email your abook.mab.BAK, history.mab.BAK, abook-1.sqlite and history.sqlite to wsmwk@thunderbird.net