✅ What I like:

• The "Quick Filter" toolbar (especially the tag filtering).
• The calendar overview showing days with events (via a little blue dot).
• The built-in contacts manager is very nice.
• Customizability has been retained in this release and ... even improved.
• The way the team has been communicating with & listening to the community while building Supernova.

📈 What can be improved:

• Thunderbird icon in Windows 11 taskbar seems smaller than other icons?
• The "compact" density setting feels too compact ... just a little bit more padding would be perfect.
• Themes that have a dark Unified Toolbar and a light sidebar (where the folders are) have the sidebar text in white. Seems like a bug. Try the "Antimuonium" theme for example. I also tried changing the interface through CSS, but I couldn't manage to fix this issue.
• Limited set of interesting and compatible add-ons? (CardBook incompatible at this moment, can't find Duplicate Contacts remover ...)
• Contact manager's search field doesn't have a button to clear the search.

❌ What I don't like:

• The new card view is not my cup of tea (yet), but I understand the use case and luckily the tabular view is still there.