My computer crashed while upgrading Ubuntu. Long story short. I installed a new boot drive. My /home is still on the other drive.

When I link my email accounts to the other drive only one account shows all the emails. I know the data is there but what's wrong?

Also how can I get my addressbooks in place?

If you have the ~/.thunderbird folder from your previous installation it contains all the information/emails/contacts/etc. that you had before. I don't really understand what you mean by "When I link my email accounts to the other drive". How many home folders do you have? If your home folder is on your old drive have you changed your partition table to reflect this new situation?
jdk

As jdkaye has pointed out, you need to access the .thunderbird folder on the original hard drive.

Open the Home folder on that drive, View > Show Hidden Files > open the .thunderbird folder.

Then copy the abcd1234.default folder to a USB stick or similar.

This folder must be pasted inside the new .thunderbird folder on the new hard drive.

Assuming that your new default folder is wxyz5678.default, the existing profiles.ini file should be modified and then saved as follows:

[General]
StartWithLastProfile=1

[Profile0]
Name=default
IsRelative=1
#Path=wxyz5678.default
Path=abcd1234.default

When you reopen Thunderbird, all your old email accounts, emails and address books etc will be there as usual.

Please note that you can keep your thunderbird profile anywhere. For example, I keep it on another partition which is mounted under ~/data so if I have a few systems on the laptop all of them are accessing using the same data. All of them have the following (notice: IsRelative: 0 and the Path value):

If you setup Thunderbird new you can go to server settings and point to the mail account somewhere else if it exists.

Sorry, but is that a question or a statement? I use Thunderbird and I looked at Edit->Preferences and couldn't find any server settings. The server settings on Thunderbird have to do with account settings such as imap/pop3 and smtp servers. But those don't have anything to do with the location of the .thunderbird folder.
jdk

Ran a search on my computer. There is no 'profiles.ini'.

At the bottom of the Server Settings window is says 'Local Directory', shows the directory and a browse button to change the path. It looks like this forum doesn't accept pics so I can't post it.

What server settings window. Are you talking about a server settings windows on Thunderbird? If so which menu is it found in?

Of course it does. Just click on the paper clip icon in the advanced menu and upload a picture. Here's one for you.
jdk

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Hey cool beans! Found it in the .thunderbird folder.

It works.
Thanks loads!!!

OK here it is

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studeski,

I am pleased that you have solved your Thunderbird mail problem.

I suggest that you now click on Thread Tools at the top of your original post and then click on Mark this thread as solved.

I'm glad you've been able to sort it out. As I said, this is about the settings for your email accounts. This has nothing to do with your question about finding your data and the location of .thunderbird. But I see that the last item of the settings page allows you to relocate the section of the .thunderbird file that deals with specific email accounts..
jdk