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In each case shortly after the start of the Thunderbird email I read:

There was a problem opening the address book "Kontakte" - the message returned was: Cannot open book: Source already loaded!

What does this mean? What must I do? I do not need those contacts!

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I solved a similar problem using this advice.

Basically, I had to disable EDS integration add-on in Thunderbird.

  1. Click "Tools" -> "Add-ons" menu item.
  2. Select "Extensions".
  3. Select "EDS Contact Integration".
  4. Press the "Disable" button.
  5. Click "File" -> "Quit" menu item.
  6. Launch Thunderbird again.

Of course, I have no idea whatsoever of what EDS integration may be.

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Thanks for a good answer - it's very nice you summarized the link you used, as the links tend to break sooner or later. Also, it's obviously a good idea to include the link to your sources. I fixed that link for you - if you want to make your posts even better, please take a look at formatting toolbar on top of editor – Olli Feb 27 '14 at 11:06

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