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* Lightning behaves unreliably with dates before 1970 or after 2037; failure modes may include JavaScript exceptions and crashes ({{bug|278236}}). Workaround: don't enter such dates. | * Lightning behaves unreliably with dates before 1970 or after 2037; failure modes may include JavaScript exceptions and crashes ({{bug|278236}}). Workaround: don't enter such dates. | ||
* Multiple users or computers editing the same calendar can collide and cause data loss ({{bug|329570}}). | * Multiple users or computers editing the same calendar can collide and cause data loss ({{bug|329570}}). | ||
== Surprising Behavior == | |||
* Delete a local calendar. Create a new one. The old events show up in the new calendar ({{bug|296202}}). Workaround: create the new calendar before deleting the old one. | |||
* Some failures when creating or viewing a calendar for the first time do not display an error dialog, though information is available in the JavaScript console ({{bug|328618}}). | |||
* Default timezone guessing is unreliable, especially in the southern hemisphere ({{bug|328996}}). Note that all events that you edit or create will end up in the default timezone. Workaround: manually set your timezone in the Lightning panel of the Options or Preferences dialog. | |||
* Setting your timezone manually does not completely take effect until Thunderbird has been restarted ({{bug|329669}}). | |||
* Outlook is unable to import some CSV-formatted calendar data exported from Lightning ({{bug|325484}}). | |||
* If one moves an event after dismissing the alarm for it, the alarm may not re-fire before the event as expected ({{bug|326352}}). | |||
== Data Loss Handling non-Lightning ICS Data == | == Data Loss Handling non-Lightning ICS Data == | ||
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* X- components are stripped out when editing or importing a calendar that contains them ({{bug|322837}}). | * X- components are stripped out when editing or importing a calendar that contains them ({{bug|322837}}). | ||
* X- parameters are stripped out when editing or importing a calendar that contains them ({{bug|322831}}). | * X- parameters are stripped out when editing or importing a calendar that contains them ({{bug|322831}}). | ||
== CalDAV Bugs == | == CalDAV Bugs == | ||