Inbox lost old messages

I changed web hosts but kept my old domain name and email addresses and installed new passwords for both mail accounts. when I went into TB it asked me for the new PW and logged in just fine and downloaded new messages but all of the old messages disappeared from the inbox. Is there any way to get then back?

With IMAP all mail is managed on the server.
The new server obviously knows nothing about the existing messages on the old server.
What you should have done prior to moving your domain to a new provider is to move all messages off of the old server to your 'Local Folders' account.
It's probably too late for that now. So unless you do have a backup of your messages on the old server, they are lost.

Similar Messages

E-mail "Inbox" of old messages have all changed to text only after Norton scan?

Hi,
Last night I did a full Norton scan of my computer and this morning found that all the "Inbox" messages "prior" to the time of the scan seem to have been changed to text only with various other codes and symbols but without the correct text formatting and any graphics. With these old Inbox messages the address and subject lines are also now empty as is the "To:" and "From:" In fact the whole space where these should appear now simply says "subject". There are also no graphics in the actual message area merely text and symbols. This has only occurred on my POP3 server Inbox. It hasn't happened to my other e-mail address which is an IMAP server. Nor has it affected the "Sent" nor "Archive" message boxes for the POP3 server system. Any new incoming e-mails I've just received this morning and post the Norton scan are ok however.
Is there someway I can recover or re-configure these old Inbox messages from what appear to be text to presumably HTML with the correct subject lines and text/graphics formatting which seems to have been lost since the Norton scan?
Many thanks.
Bob

Did Norton find anything in the Thunderbird profile. It sounds to me like it has quarantined your entire inbox, something Norton is very good at and the people and Norton are totally unapologetic for. Their attitude is they saved you, you should be grateful that they deleted a great load of your mail.
Personally I voted with my feet. No Symantec product get installed on any device I have anything to so with. I consider them as bad as the virus they are supposedly protecting me from.

TB stopped retrieving new messages and trying to "reconfigure" my account to fix the problem, now I lost my old messages.

[4/15/14 edit #3] I posted the requested troubleshooting information and made a backup of Profiles using MozBackup, so my remaining problem is the presence of two Inboxes, both receiving messages, and my not being sure which one can safely be deleted nor how to safely delete it.
[4/14/14 edit #2] T'bird's Help taught me where my "Profiles" are stored but I found I had no backup of them. However, I now discover that I have TWO Inboxes - hadn't noticed that quirk before. Thankfully, one of them still contains all of my old messages! The Inbox that still has all of my old mail is listed as a subfolder under "Local Folders" and the Inbox that I thought was my only Inbox is listed as a subfolder under the top folder whose name is my email address. Both Inboxes are now retrieving my new mail. Does this mean I have somehow created two accounts? If so, how do I get rid of the account that uses the Inbox that does not have all my old mail in it? I don't want to get rid of the wrong account but I suspect the "right" one should be listed under my email address, not under "Local Folders". If anyone understands this mess that I've created, I'd really appreciate some advice so I don't make things worse. At least I've now learned what it is that I need to back up.
[4/14/14 edit #1] Following is a major update of the problem I described before (see below). I disabled the Mail Shield portion of my Free Avast antivirus software and discovered that TB was again able to retrieve my email. Then I re-enabled Avast to see if it blocked TB again. It did not. So, apparently simply turning Avast's Mail Shield off and then back on again seems to have fixed the problem. However, I'm now left with the consequences of my having tried to "reset" TB as I described below, namely the loss of a very large number of emails that were stored in my Inbox. So the remaining problem I'd like help with is how to recover those seemingly lost emails. If they remain on my hard drive, where did TB store them and what specific files should I look for? I do have a backup of some of my hard drive (but nothing under Program Files), but I need to know how to identify them, where to look, and how to get them back into my Inbox without deleting its current contents. I'd really like to also retain their original dates, if possible. I'm running 64-bit Windows 8.1. [end of 4/14/14 edit]
TB suddenly stopped downloading my mail today. After I click Get Mail, I can see at the bottom of the screen a very rapid succession of messages; first the "connected..." message, then "checking...", then "downloading 1 of 10...", then finally, "No messages to download" after downloading absolutely none of them. I also noticed that my list of mailboxes was missing the very first entry that showed my email address as the account name. Figuring something major must have been changed in my account configuration, I went through all the settings but saw no problems. Finally, I decided to try to re-establish my same account. That did place my email address again back at the top of the mailbox listings as my working account name but it also created a worse problem. There were now no messages in my inbox, I suppose because I must have created a new account using the same name as the old one, whereas before there were thousands of messages that I had saved for many years (since this is a business). Then when I clicked Get Mail, TB downloaded 383 messages that had not yet been deleted from the server, giving then all today's date (another loss since their original dates were important). But after it finished downloading all of them, clicking Get Mail still does not retrieve any messages past the time that it stopped retrieving them earlier today. Those newest messages remain on the server - but now there are 14 of them instead of 10. The same succession of TB messages appears at the bottom of the screen, but now it says "Downloading 1 of 14..." but still downloads none of them and ends with, "No messages to download". This sequence of messages will repeat as often as I try to retrieve mail but it can still count how many it is NOT downloading. Two questions: (1) Are the thousands of messages that were stored in my Inbox still stored somewhere on my computer and is there any way to recover them? (2) How can I get TB to start retrieving my current email again? I guess it's obvious that these are important problems to me and that I'm totally stumped. Many thanks in advance.

Sorry. Here is the Troubleshooting Info:
Application Basics
Name: Thunderbird
Version: 24.4.0
User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0
Profile Folder: C:\Users\Phil\AppData\Roaming\Thunderbird\Profiles\p8gz2q23.default
(Local drive)
Application Build ID: 20140316131045
Enabled Plugins: about:plugins
Build Configuration: about:buildconfig
Crash Reports: about:crashes
Memory Use: about:memory
Mail and News Accounts
account1:
INCOMING: account1, Local Folders, (none) Local Folders, plain, passwordCleartext
account2:
INCOMING: account2, [email protected], (pop3) pop.att.yahoo.com:995, SSL, passwordCleartext
OUTGOING: smtp.att.yahoo.com:465, SSL, passwordCleartext, true
OUTGOING: smtp.att.yahoo.com:465, SSL, passwordCleartext, false
account5:
INCOMING: account5, [email protected], (pop3) inbound.att.net:995, SSL, passwordCleartext
OUTGOING: outbound.att.net:465, SSL, passwordCleartext, true
Extensions
Check for Updates in Help Menu, 1.1, true, [email protected]
CompactHeader, 2.0.8, true, {58D4392A-842E-11DE-B51A-C7B855D89593}
Remove Duplicate Messages (Alternate), 0.3.9, true, {a300a000-5e21-4ee0-a115-9ec8f4eaa92b}
ViewAbout, 2.0.1, true, [email protected]
Extra Folder Columns, 1.1.5, false, extra-cols@jminta_gmail.com
Important Modified Preferences
Name: Value
accessibility.typeaheadfind.flashBar: 0
browser.cache.disk.capacity: 358400
browser.cache.disk.smart_size.first_run: false
browser.cache.disk.smart_size.use_old_max: false
browser.cache.disk.smart_size_cached_value: 358400
extensions.lastAppVersion: 24.4.0
mail.openMessageBehavior.version: 1
mail.winsearch.firstRunDone: true
mailnews.database.global.datastore.id: 9bbfa749-eb91-4c2e-9a9a-d0e0146e393
network.cookie.prefsMigrated: true
places.database.lastMaintenance: 1397067237
places.history.expiration.transient_current_max_pages: 52770
places.history.expiration.transient_optimal_database_size: 85415034
plugin.importedState: true
privacy.donottrackheader.enabled: true
Graphics
Adapter Description: Intel(R) G45/G43 Express Chipset (Microsoft Corporation - WDDM 1.1)
Vendor ID: 0x8086
Device ID: 0x2e22
Adapter RAM: Unknown
Adapter Drivers: igdumd64 igd10umd64 igdumd32 igd10umd32
Driver Version: 8.15.10.2702
Driver Date: 3-11-2013
Direct2D Enabled: false
DirectWrite Enabled: false (6.3.9600.16384)
ClearType Parameters: Gamma: 2200 Pixel Structure: RGB ClearType Level: 100 Enhanced Contrast: 100
WebGL Renderer: false
GPU Accelerated Windows: 0
AzureCanvasBackend: skia
AzureFallbackCanvasBackend: cairo
AzureContentBackend: none
JavaScript
Incremental GC: 1
Accessibility
Activated: 0
Prevent Accessibility: 0
Library Versions
Expected minimum version
Version in use
NSPR
4.10.2
4.10.2
NSS
3.15.4 Basic ECC
3.15.4 Basic ECC
NSS Util
3.15.4
3.15.4
NSS SSL
3.15.4 Basic ECC
3.15.4 Basic ECC
NSS S/MIME
3.15.4 Basic ECC
3.15.4 Basic ECC
ISP is AT&T, anti-virus is (free) Avast, Windows firewall

I just opened my mail on icloud and all messages disappeared from the last year! I have one email left in my inbox which is the most recent. I moved to icloud 2 weeks ago and it has been working fine until now. How can I retrieve old messages? Thank you.

i just opened my mail on icloud and all messages disappeared from the last year! I have one email left in my inbox which is the most recent. I moved to icloud 2 weeks ago and it has been working fine until now. How can I retrieve old messages? Thank you.

I guess you could try but I don't believe Apple can help with activation lock issues. They may, however, be able to determine if the Apple ID belongs to one of you and reset the password for you if you can prove your identity.
You might want to try calling Apple by going to https://expresslane.apple.com; click 'More Products and Services, then 'Apple ID'. In the next page select 'Other Apple ID Topics' then 'Lost or forgotten Apple ID password'. Perhaps they can help determine if it's your ID and reset the password for you (and they probably have more expertise in doing this than the Apple store).

Mail is moving old messages from folders into the inbox

Hey,
Mail has started behaving really weird. It has started to move old messages, from various folders into the inbox. When i try to move it back, i have to use the contextual menu to do that, drag and drop doesn't work.
Has anyone experienced this before? Help is greatly appriciated!
/Andreas

Hi Andreas.
Verify/repair the startup disk (not just permissions), as described here:
The Repair functions of Disk Utility: what's it all about?
After having fixed all the filesystem issues, if any, and ensuring that there’s enough space available on the startup disk (a few GB, plus the space needed to make a backup copy of the Mail folder), proceed as follows to re-create Mail’s index:
1. Quit Mail if it’s running.
2. In the Finder, go to ~/Library/Mail/. Make a backup copy of this folder, just in case something goes wrong, e.g. by dragging it to the Desktop while holding the Option (Alt) key down. This is where all your mail is locally stored.
3. Locate Envelope Index and move it to the Trash. If you see any other “Envelope Index”-named file there, delete it as well.
4. Move any “IMAP-”, “Mac-”, or “Exchange-” account folders to the Trash. Note that you can do this with IMAP-type accounts because they store mail on the server and Mail can easily re-create them. DON’T trash any “POP-” account folders, as that would cause all the mail stored there to be lost.
5. Open Mail. It will tell you that your mail needs to be “imported”. Click Continue and Mail will proceed to re-create Envelope Index — Mail says it’s “importing”, but it just re-creates the index if the mailboxes are already in Mail 2.x format.
6. As a side effect of having removed the IMAP account folders, those accounts may be in an “offline” state now. Do Mailbox > Go Online to bring them back online.
Note: For those not familiarized with the ~/ notation, it refers to the user’s home folder. That is, ~/Library is the Library folder within the user’s home folder, i.e. /Users/username/Library.

Is there a way to merge Mail account A on my desktop with Mail account A on a separate hard disk? I lost all my old messages in July, but they are on the hard disk. Thanks!

Is there a way to merge Mail account A on my desktop with Mail account A from separate hard disks? I lost all my old messages (thousands of them) in July, but most of them are safe elsewhere. I'd really like to put them all in one place, though!
The desktop (iMac) now has messages from July 2012 onward.
My separate hard disk backup has old messages up to June 2012.
Most of the ones between June and July are on a MacBook Pro which I bought about that time.
Is there a relatively easy and safe way to put these messages back together in Mail account A on my desktop again?
Many thanks!
SqVerka

Well, your profile info says 10.4.11, and you are posting your question in the iMac (PPC) category. If you are running Snow Leopard, it must be a fairly recent Intel iMac.
In that case, you should definitely post your question here
https://discussions.apple.com/community/mac_os/mac_os_x_v10.6_snow_leopard
where other Snow Leopard users can see your question. Restate the problem, what error messages you get, and what you have tried already (for trouble-shooting).

I have a new iPhone and have kept my old one to play music in another room, when i recently updated my new iPhone it has backed up to my old iPhone and I have therefore lost pictures, messages etc from my new phone how can I get it all back?

I have a new iPhone and have kept my old one to play music in another room. I have recently updated my software on the new iPhone and when it backed up it backed up to the old iPhone, I have therefore lost pictures, messages and apps from my new iPhone as it has backed up to the last session of the old phone, how can I get all my new stuff back and stop it from happening again?

BarnsleyMif wrote:
I have recently updated my software on the new iPhone and when it backed up it backed up to the old iPhone
No such thing has occurred. iPhones do not backup to one another.
It is not possible to backup a different iPhone from the one being updated.
If the iPhone was restored with a backup from a different device, restore it again from the correct backup.
BarnsleyMif wrote:
how can I get all my new stuff back and stop it from happening again?
Pay attention when restoring the iPhone and select the correct backup to restore from.

Lost Email Messages in Inbox

I've recently purchased a new PowerBook to replace my older Powerbook, and recently used the Migration tool to move all my files, settings, applications etc across to the new machine.
Mail 2, upon starting for the first time does it usual conversion of stuff and correctly notes the 28174 messages. However when it say you can start using Mail, it only displays the most recent mail messages for the last seven days (273 messages). Which is not the 10198 messages I have on my old Powerbook in my Inbox (this about the last six years of mail). And I do archive mail regularly into other folders.
I've tried rebuilding the mailbox, checking permssions - the mbox file size it identical to my old machine (518Mb). I've subsequently quit Mail, removed all the folders under ~/Library/Mail, restarted my old Powerbook in firewire mode and tied doing an import through Mail 2 with exactly the same result.
I note a few other people have posted similar experiences with Mail 2. Given this is my first experience with Tiger (10.4.5), until I see this being resolved
I'll use my old Powerbook (10.3.9). Thus far not impressed at all.
PowerBook G4 Mac OS X (10.4.5)
PowerBook G4 Mac OS X (10.4.5)

I ended up going back and completely reinstalling the new PowerBook from scratch in case something was up and tried migrating again - same situation.
Next I removed all the files/folders under the /Users/~/Library/Mail directory (ie blank slate)
Having read similar posting from people, I then broke up my Inbox into folders by year received on the old Powerbook and then rebuild each of the mail folders. This had the Inbox down to 701 messages, with each of the folders holding between 396 to 1783 messages each. Restarted my old Powerbook
in firewire mode and then performed a Import Mailboxes. Once the import was
done, the old messages broken into various folders looked ok (ie number of messages matched), however the Inbox showed only 243 messages not the 701 messages originally there. In fact it appeared that only messages received in March were displayed and nothing else. I tried performing a Rebuild of the mailbox and all the messages (all 243) disappered. Searching
failed, as did any further Rebuilds.
So again I cleaned out the Mail directory on the new Powerbook, ejected firewire Powerbook drive and restarted the old Powerbook as normal. On
the old Powerbook, I then created another folder and moved all 701 messages in the Inbox to the newly created folder, thus the Inbox was empty. Restarted the old Powerbook in firewire mode and repeated the Import Mailbox process.
The seemed to go ok, all the messages were there, however I could not move the messages back to the Inbox from the folder. Given the previous experience with rebuilding a mailbox, I tried Rebuilding any of the folders partly to see if the same thing would re-occur - which it did, any mailbox selected and then a Rebuild performed would appear to delete all messages within the folder.
If I look at any of the folders directory using Terminal, I see the following:
-rw------- 1 evans evans 136022756 Apr 1 16:10 Incoming_Mail
-rw-r--r-- 1 evans evans 541600 Apr 1 16:10 IncomingTable_ofContents
-rw-r--r-- 1 evans evans 356 Apr 1 22:30 Info.plist
drwx------ 1784 evans evans 60656 Apr 1 23:00 Messages
The Incoming_Mail file is basically a mbox file (comparing it to 10.3's Mail),
IncomingTable_ofContents, is a concatenation of Subject (with additional formatting). Info.plist is a file containing display information for the folder itself and finally Messages is a folder containing the Mail 2 of the individual messages.
Out of curiosity I wondered if the TableofContents file was somehow being corrupted, so I removed the file and then went to look at the folder - oddly enough I could now view all the messages, whereas before after doing a Rebuild they completely vanished.
In other folders I found the Messages folder has a name of Messages-T0x4c5c70-fTrRll, removing IncomingTable_ofContents in this instance made no difference, nor did removing the Messages-T0.. folder and renaming the Incoming_Messages to mbox and trying a Rebuild again.
I've subsequently cleaned out the Mail folder on the new Powerbook and again perfomed a Import Mailboxes.
From observations there appears to definitely be a problem when importing mail from 10.3.x as well as performing a mailbox rebuild, though I've yet to
determine the cause of the failures.
So looks like its back to the old Powerbook and reliable 10.3.9.

Mail migration assistant did not upload old messages in inbox during upgrad

The mail migration assistant did not upload the contents of old messages stored in my inbox for mail in panther to tiger. It uploaded drafts and sent mail messages and even the husks of the messages themselves into the new inbox but not their contents, not the information contained in the messages themselves. I see that the old messages are accessible via spotlight but only their external identification remains in the new inbox, not what was in them. Is their anyway to rerun mail migration assistant or the mail setup assistant (whatever it may be called) so that it uploads all of messages from my old inbox under panther to the new inbox under tiger? I believe that while running initaially soon after I launched mail for the first time under tiger, the migration assistant for mail quit early, maybe because I had many messages stored in my inbox.
So my basic question is, is it possible to rerun the program that migrates mail from the old inbox under panther to the new inbox under tiger? If it's not, is it possible to first of all empty out the current inbox with its group of the external skeletal remains of messages but lacking their substance, the information contained in them, and then refill my current inbox with the entirety of the message, i.e., not just its identifying information, its external identification (from whom and about what), but also what the message at one time contained? In each of these messages it only has this bit of information: "The message from 'such and such a sender' with 'such and such a subject' has not downloaded from the server. You need to take this account online in order to download it." But of course I am online. The online bit I supose the message is about is the being online with the migration assistant, and that's the being online I would really like to go back to I suppose, before it seems to me this mail migration assistant quit on me prematurely, without uploading or downloading, whatever the term, the entire content of my inbox with its batch of received messages. In the process, it did, however, capture the entirety of my drafts and sent messages from their particular boxes.
Please help. How can I redo the migration step from panther mail inbox to tiger mail inbox so that my mail is in its inbox and reachable there as opposed to apparently being searchable by only spotlight?
Thank you.

I am having a similar problem. I just upgraded from 10.2.8 to 10.4.3. It didn't go well (a USB peripheral interfered)and I ended up upgrading while archiving users.
There was no 'restore users opportunity'. I have done a lot manually, which is painful...in fact reminiscent of why I don't like PC's. Anyway, I was able to locate and restore almost all the mailboxes, including a bunch of deleted files from the 'Previous Systems' folders. I still haven't found the secret location of all the email that was in the "Inbox".
I would greatly appreciate it if someone in the know could share where and how to restore my old inbox so I can get my important emails back. Hacking or magic software...what ever it takes.
Thanks

Nokai C2-00 ~ Can Find Old Message in Inbox

Hi Friends....!
I recently purchased Nokia C2-00, In that - I can't find my SIM1 & SIM2 old messages at my Inbox. And i tried with another mobile which shows my inbox messages. But not in NOKIA C2-00. This is my problem.
Kindly say a solutions to solve this problem.
Regards,
MusicLover.
Solved!
Go to Solution.

Hello MusicLover5628, open messages>options>sim messages. Am not sure whether this will help but just give it a try.
Nokia C7

1 year old messages return to inbox when I change boxes

I actually had this problem in Tiger and to my great surprise and disappointment it continued when I upgraded to Leopard.
Any time I go from one inbox or folder and then back to my mail inbox, a message will appear from roughly 1 year ago at the top of my inbox. The old messages seem to come in the sequence they came in a year ago - so I'll look in a mail folder and then return to my inbox to see a message from Nov. 17th 2007 from 10:25am. I delete it, and then if I repeat the process another message will come from the same date but 10:28am or whatever. If I don't delete them then no new (old) messages come.
I use 1and1.com pop mail service and those messages are long-gone from my mail server. It's taking them from either my archive or junk/trash folders.
If I erase junk and trash folders, then only message that are still on my system (in various folders) show up. They can be sent, archived or in a daily subscription folder that I want to keep.
Any thoughts?

Try rebuilding your Mail index like this:
1. Quit Mail if it's running.
2. Go to ~/Library/Mail and delete the Envelope Index file.
3. Restart Safari and wait for it to import your existing messages. When it's done, check to see if the problem persists. And you should empty the Trash in Mail when you quit the program. You can change that automatic behavior in Preferences > Accounts > Mailbox Behaviors (check the box to move deleted messages to a separate folder and choose 'Erase deleted messages when:' "Quitting Mail from the pop-down menu.
Mulder

Mail showing very old messages in inbox

When I do a search on someone's name for whom I have received an email, I often get other emails with that same name (but a different person) that are from 2005!when I click on the email, there is nothing showing in the preview and there's nothing when I click on 'Show in mailbox' either. Any ideas where these very old messages are stored???

I see the choice in Mailboxes. I just tried it and unfortunately it wiped out all my 'trash' contents. I typically keep trash for 6 months out in case I need to refer to thing that inadvertently found there way there instead of a folder. Darn. I hadn't realized it would wipe out the ones in the trash folder. Yeah, I know they were 'deleted' from the inbox, and others, etc. but I still considered them safe until I deleted them physically from the trash mailboxes. My error but I can recover them from Time Machine. And ironically, the emails from 2005 are still showing up when I do a find on say, the name "kate". Oh well. still unresolved at this point. thanks for trying though.

Adding Lightning, I lost ALL my OLD messages

Hello, after adding the add-on Lightning ?in? my Thunderbird account, I discover that ALL my old messages are away.
How to find/get them back?
I hope somebody can help me!
Thanks in advance,
visje49

angelafromnewjersey wrote:
I upgraded my phone to IOS8 and a few hours later I lost all of my old text messages. It was working for a while and then stopped. Help!
What do you mean it was working for awhile and stopped working? You stated you lost old text message?
either way, you restore from your icloud/iTunes backup to get back those text message.
If you don't have a backup then there is no way to et those message back.

New computer; lost all messages

Hi-
I've lost my messages and I sent myself a test from my hotmail account, and it wasn't received. Something is going on with my new computer. I just bought and set up a new iMac 20".
I migrated files via the method described here:
http://discussions.apple.com/thread.jspa?messageID=1872713
In terms of mail, the only thing suggest to bring over was: /Home/Library/Mail (copy the whole folder)
I did so. But, when I opened mail, there's nothing there. Nothing in inbox, sent or deleted. And, like I said, when I sent myself a test, nothing came through.
Can anyone tell me how to get my messages and how to get my mail working again? I'm stumped. Thanks.

Also, just another piece of information that is weird, and I don't know if it helps. When I got to preferences in mail and click the "accounts" tab. I see my account there in the left but it says:
.Mac (inactive)
Sounds to me like my account is inactive but I have no idea why, and how to get it back. Everything was fine with my old Powerbook. This is a recent development with my iMac. Thanks.

How can I move my old messages from my PC to my new Macbook (not the profile, just the messages)?

I have used Thunderbird for years as I am a business owner who needs to keep a copy of old emails. I have just changed from a PC to a Macbook pro, and want to move all my old archived messages from the past 2 or 3 years to my Mac, including non-archived messages (Sent & Trash) from this year. I have already created my profile in the new Mac, and have been using it for the past couple of weeks. (By the way, this is a POP mail profile.) Now I just want to move the old messages over. Which exact files do I copy and paste, and into which folders? If the folders do not yet exist, I guess I need to create them first. But where on the Mac? I have found (on my old PC) the "Appdata/Roaming/Thunderbird/Profiles/*.default/Mail/username/ directory with Archives and Trash subdirectories. But each directory seems to have a name (like "Inbox", or "Sent" or "2013") and another file with the same name, but an ".msf" suffix (like "Inbox.msf" or "Sent.msf" or "2013.msf"). Thanks in advance to any who can help.

The file structure is a little complex. I will use inbox as an example.
Inbox (a large file with no file extension)
Inbox.msf ( An index of inbox with tags etc. Can be deleted with only loss of tags)
Inbox.sdb (a folder, indicating that the folder within Thunderbird has a sub folder.
POP mail is stored in
Appdata/Roaming/Thunderbird/Profiles/*.default/Mail/[Server name]/
Local folder is stored in
Appdata/Roaming/Thunderbird/Profiles/*.default/Mail/Local Folders/
As long as you do not overwrite, you can copy and paste whole folder trees into local folders (stuff on your old computer under a mail account is best relocated to local folder and then sorted as necessary afterwards.
Note that you should delete foldertree.json after making those sorts of copies (it forces a full refresh of the folder tree, no cache) and under no circumstances copy data with Thunderbird running. It can irrevocably corrupt things

Inbox lost old messages

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