This is covered in https://bugzilla.mozilla.org/show_bug.cgi?id=1855900 - some design work is needed.

I've been using Sunbird 0.9beta since 2007, and Thunderbird also (currently TB 128).

A couple of days ago, I exported all of the Sunbird calendars as *.ics files, then imported into Thunderbird calendar. It went smoothly and I have all of the functionality I need, except the ability to search "All events" (i.e. past events).

Sunbird had "All events", but Sunbird also had a really slow indexing function (the first time you click 'Find events' after starting up Sunbird. Thunderbird calendar doesn't have that problem at all - there is never any delay after clicking 'Find events', even with 30,000+ events in 16 calendars.

My question is about how the search/indexing is done. Was Sunbird really slow to index because it indexed ALL 30,000+ events to be able to provide the ability to search "All events", and Thunderbird calendar is fast, because it does NOT index the past events? Or perhaps the indexing speed is just a change in technology, e.g. perhaps Javascript search in Sunbird, and now compiled code in Thunderbird calendar?

Right now, I can't really work with Thunderbird without "All events", so I may have to go back to Sunbird until this is changed.

Thanks for all of the great work on these products. I'm really impressed with being able to use Sunbird 0.9 beta all of these years since 2007. It was a great product. It had a better way to display the event when double-clicked. It came up in a fixed window (no resizing window to view it) and it was already in edit mode. If you just wanted to look at it, just close the window (with appropriate warning if it had been modified). That "edit" button seems really superfluous and unnecessary.

I've been using Sunbird 0.9beta since 2007, and Thunderbird also (currently TB 128). A couple of days ago, I exported all of the Sunbird calendars as *.ics files, then imported into Thunderbird calendar. It went smoothly and I have all of the functionality I need, except the ability to search "All events" (i.e. past events). Sunbird had "All events", but Sunbird also had a really slow indexing function (the first time you click 'Find events' after starting up Sunbird. Thunderbird calendar doesn't have that problem at all - there is never any delay after clicking 'Find events', even with 30,000+ events in 16 calendars. My question is about how the search/indexing is done. Was Sunbird really slow to index because it indexed ALL 30,000+ events to be able to provide the ability to search "All events", and Thunderbird calendar is fast, because it does NOT index the past events? Or perhaps the indexing speed is just a change in technology, e.g. perhaps Javascript search in Sunbird, and now compiled code in Thunderbird calendar? Right now, I can't really work with Thunderbird without "All events", so I may have to go back to Sunbird until this is changed.

Thunderbird stores all the events. But it simply doesn't display them all. https://bugzilla.mozilla.org/show_bug.cgi?id=1855900

Thanks for all of the great work on these products. I'm really impressed with being able to use Sunbird 0.9 beta all of these years since 2007. It was a great product. It had a better way to display the event when double-clicked. It came up in a fixed window (no resizing window to view it) and it was already in edit mode. If you just wanted to look at it, just close the window (with appropriate warning if it had been modified). That "edit" button seems really superfluous and unnecessary.

https://connect.mozilla.org/ is the best place to post and vote for suggestions.

I just found this problem, too. It also will not let you search for future events longer than 12 months out. What happened to being able to search for all future events as well as searching for past events?

This is covered in https://bugzilla.mozilla.org/show_bug.cgi?id=1855900 - some design work is needed.

Covered? I only see endless academic discussions there, while this is a disastrous degradation of functionality. We are currently wasting lots of time on "when was the last meeting of team xxx?"