Very weird!
Try this in Tbird.
in the toolbar, look for Tools-> Account Settings.
Scroll down(LHS pane) to Local Folders. click on that.
on the RHS now, look for the Local Directory setting which shows you the directory string where the local folders are located.
For whatever reason, it seems that it got set to be your username(eg. Garry) under the User directory on the C drive.
On that directory string hit the browse button.
Now because you've set your user data to be non Windows standard, you have to locate the User/< your username, which I assume is Garry??>\AppData\ Roaming\Thunderbird\Profiles\<cryptic folder name for profile.default>\Mail\Local Folders
The named bits in between the <> are the variables that will be specific to your installation.
eg. for my situation I have for <'your username'> Arthur
and for the cryptic Profile name mine has been set to 198bt2gu.default Why that default profile name is unknown that's what Tbird setup for me.
So as a guess for your situation, I'd say you sent your User Data to be on the 500Gig (possibly) D drive?
Look for the AppData path in there maybe.
Either way, where ever your AppData path is, the important part of it is the last couple of paths of the directory .. ie. the \Mail\Local Folders section.
This is where Tbird stores and archives all your mail that you saved to the PC.
Becasue I have 5 mail accounts that I use, my LHS folder/email structure looks very different to yours, as you only have one mail account to manage.
Here's a screen shot of how it looks on my Tbird interface
Attachment 144235
Everything below the Local Folders, I created to separate the emails of various topics. rightclick on the area you want a new folder in, and choose new folder or sub folder kind of thing
eg. you see I have Business - Vodaphone- 3! folders where I've kept my mobile phone invoices. ATO rules require you keep business invoices for 7 years, and in a few years I no longer need to keep those records.
If I just kept them all in the one archive space, I have to then search/filter for them amongs the myriad of other emails when the time comes to clear them out.
This way I just delete the entire folder as is, as it's no longer required.
I'd say because you located your User data on the other drive, T-bird may have misunderstood where to keep it's record keeping structure or whatever.
This is why it's important to fully understand how a program installs itself when tweaking to a specific requirement.
If you look in the AppData folder for the Tbird mail structure, it's not a folder structure as Windows Explorer directory that we understand.
It's all .msf files, and .dat files and other cryptic stuff, basically internal Tbird settings files. Tbird just displays the folder structure to me in the Tbird interface window ..
Something else to be mindful of.
If you uninstall Tbird, for example to correct the Local Folders issue you got. It doesn't delete the emails you currently have on your PC now. It still leaves them all on the email server on your ISP too.
Tbird has a setting to configure if you want to leave the emails on your ISP server for a few more days(I think 2 weeks is the default), or if you delete them via Tbird, it then deletes them off the ISP server too.
You can configure this if you want/need too.
But if you reinstall Tbird again in the same way you did the first time, and you don't remove the Profile, it'll just do the same thing.
