590942 - Impossible to get back from lightning 1.1 to lightning 0.9 version

Status: RESOLVED WONTFIX

(Calendar :: General, defect)

Description

[sailing_971]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; fr; rv:1.9.2.8) Gecko/20100722 Firefox/3.6.8
Build Identifier: Thunderbird 2.0 and Lightning 0.9

I upgraded to Thunderbird 3.1.2 version. I was using lightning and it upgraded to 1.2b version. 
But because I found Thunderbird 3 rubbish and furthermore was not compatible with other key add-ons such as Plaxo for Thunderbird, I re-installed Thunderbird 2.0 version. 
But Lightning 1. does not run with Thunderbird 2 version so I desinstalled Lightning 1. to reinstall Lightning 0.9. 



Reproducible: Always

Steps to Reproduce:
1."the calendar data in your profile was updated by a newer version of Lightning, and continuing will probably cause the information to be lost or corrupted. Lightning will now be desabled and Thunderbird restarted"
2.Each time I enable Lightning, it won't enable until I restart Thunderbird
3.Same message pop up again and Lightning won't be enabled
Actual Results:  
Thunderbird starts OK but there is no way to enable Lightning

Comment 1

[Philipp Kewisch [:Fallen][☁️📆]]

Sorry, this won't happen. The release notes mention that you should back up your profile before upgrading, although I know this isn't very visible from the addons updater.

What would need to happen to fix this bug is that we write a downgrader for each database schema change. Between 0.9 and 1.0b2 there have been a lot of database changes. Even if we do write those, then its likely there will be dataloss when going through an upgrade -> downgrade -> upgrade cycle.

What you can do to retrieve your data is to export everything to .ics files in Lightning 1.0b2 using the export wizard, then create a new Profile in 0.9 (see <https://support.mozillamessaging.com/en-US/kb/Profiles>), and then import the previously exported data.

To locate your profile, see this page for more information: https://support.mozillamessaging.com/en-US/kb/Profiles