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Could somebody please tell me how to roll Thunderbird back to 11.x, or get a working version of Lightning (which claims it is incompatible with 12.0). I'm currently not able to view my calendar :(

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I would have said, install the addon compatibility reporter addon, but it links to this page… to say that it doesn't work any more. Bummer. – zpletan Mar 30 '12 at 4:29
The latest stable release is TB 11; how did you get on TB 12? Are you using a PPA? Are you using 12.04? Did someone set up beta TB releases for you? Any information on how you got this version will go a long way towards getting you back to the stable version (assuming that's what you want). – zpletan Mar 30 '12 at 4:38
Look at this here How to install Thunderbird 10.0 after Thunderbird 11.0 is already installed? – Ringtail Mar 30 '12 at 5:02

You neednot downgrade thunderbird to get working version of Lightning. Install this addon

It will search for compatible version of Lightning and install it

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There is no 64 bit support here so this will not work for most users. – micahg Mar 29 '12 at 21:06

If you want to stick with the in distro packages, you can use ppa-purge to remove the thunderbird-next PPA until compatible versions of lightning are available there. This should roll you back to the distro version 11.

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You might see if the Nightly Tester Tools addon can still disable addon compatibility checking. (The Add-on Compatibility Reporter addon, which I would have otherwise recommended instead, no longer disables compatibility checks.)

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