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I've setup Thunderbird (default in 12.04) with five mail accounts. Unfortunatly, every mail address is shown only with its own inbox, sent...

How can I get a combined inbox for all addresses? I've searched for extensions, but did not find any that add this feature.

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Have you tried just keeping your separate accounts, but have received at one in-box. This preserves your ability to send as the various identities. – david6 May 7 '12 at 9:14
@david6 Sorry, but I don't understand what you mean. Using the solution provided in the accepted answer, I'm still able to send an e-mail using any identity. – user24668 May 7 '12 at 9:18
I have 8+ external (ISP) mailboxes. I have only three in-boxes, for: business, personal, and other. Under Account Settings > Server Settings > Advanced, I can have other emails accounts downloaded to an existing mailbox (shared in-box). – david6 May 7 '12 at 9:53
@david6 Ah, ok! I understand now. :) No, I have not tried that because I'm using different email clients on different platforms (iOS, OSX, Ubuntu). I basically keep the default IMAP configurations and use one combined inbox for all accounts. – user24668 May 7 '12 at 10:07
up vote 32 down vote accepted

I believe the feature you are looking for is called 'Unified Folders' which works on both IMAP and POP3 protocols.

The official site location:

Quote from the site:

Unified Folders (originally named Smart Folders when it was added in 3.0) is a folder pane view which looks like a global inbox account by merging the contents of all inbox folders (both POP, IMAP and local folders) from all accounts. It also shows the inbox of each account as a child folder of the unified Inbox account. Any messages in an inbox shows up in both the root of the unified Inbox, plus the child folder of the unified Inbox for that account.

To use this functionality:

View >> Folders >> Unified

I have verified that this does work on Thunderbird 12.0.1 using Ubuntu 12.04. The KB article I found above it a bit old but still holds correct information about the functionality of the 'Unified Folders'.

If you are just trying to combine the Inbox only and leave the rest as is, it does not look like it can be done but extensions can be made in the future to have this feature in Thunderbird.

Hope this is helpful.

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Indeed! Thanks it. Thank you very much for your help. – user24668 May 7 '12 at 5:35
Glad this is what you were thinking of. Happy to help. – ruffEdgz May 7 '12 at 13:44

Click view, folders then "unified"

This should sort it for you.

Hope it helps.

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That's right! Thank you. – user24668 May 7 '12 at 5:36
Ah, okay, Thunderbird 17 the "Folders" menu is no longer under View but is by itself in the second column of menu items. – Chinasaur Jun 10 '13 at 0:22

Ok, this is the method I believe the OP may have wanted:

Tools --> Account Settings. Then select the mail account you want to download into Global Inbox. Then select "Server Settings" menu branch, then at the very bottom in the "Message storage" area, opposite "empty trash on exit" is an "Advanced" tab, and hey presto!

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Please be more elaborate with your answer. Expanding the "hey presto" would be a start... – Sri Jan 6 '15 at 5:19

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