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It would sure be nice if I had a calendar program for Thunderbird 3.0b4... The current Lightning add-on will not work with this version of Thunderbird... Is there anything that will?

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I'd say just wait it out. Since TB is still in beta. Once it is outta beta I imagine the Sunbird addon will be updated. – MrStatic Oct 23 '09 at 14:15

Download a Lightning nightly build from Mozilla. It's beta software so please do backups or try on a test account.

When you hit the site:

  1. Click on your platform (my platform is Mac OS X Leopard)
  2. The build will download
  3. Install the nightly.

If there any further questions about this you may need to file a support request with Mozilla Messaging

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When I try to add the add-on, I get an "incompatible with Firefox 3.0" error... I must be missing something... dustoff – dustoff316 Oct 25 '09 at 13:43
Right click > Save as, then install it in Thunderbird. Just clicking the install link tries to install it to Firefox. – Macha Oct 31 '09 at 0:34

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