Yes, being able to differentiate tentative appointments in the views would be very helpful as I use that as "informational" meetings, i.e. I want to know that they're happening but I don't attend regularly.

Please support the event status (tentative, confirmed, cancelled).

This standard feature is part of the iCalendar Core specification as per RFC 5545 3.8.1.11 (Status). Some applications such as Thunderbird Lightning and Apple iOS calender app already show the status of events. Unfortunately, it seems there is no support by Android calendar apps. Please let me know in case there is one. So, I'm wondering about this fact since the element is supported by the Google calendar API as well sync tools such as DAVx5.

Implementation of status by BC would be a stand-alone feature and USP!
BC might show tentative events in italics, cancelled events as strike-through text and confirmed ones as normal text.

Many uservoice suggestions already address this or related issues counting overall more than 60 voices (April 2020):
04 6107268-tentative-appointments
33 13836738-i-would-like-to-see-tentative-free-and-out-of-off
13 32776711-differentiate-tentative-appointments
03 35955331-manuelle-zusage
07 36519961-participation-status
01 39617575-status-ändern-können-bzw-nicht-als-vorläufig-im

Please support the event status (tentative, confirmed, cancelled).

This standard feature is part of the iCalendar Core specification as per RFC 5545 3.8.1.11 (Status). Some applications such as Thunderbird Lightning and Apple iOS calender app already show the status of events. Unfortunately, it seems there is no support by Android calendar apps. Please let me know in case there is one. So, I'm wondering about this fact since the element is supported by the Google calendar API as well sync tools such as DAVx5.

Implementation of status by BC would be a stand-alone feature and USP!
BC might show tentative events in italics, cancelled events as strike-through text and confirmed ones as normal text.

Many uservoice suggestions already address this or related issues counting overall more than 60 voices (April 2020):
04 6107268-tentative-appointments
33 13836738-i-would-like-to-see-tentative-free-and-out-of-off
13 32776711-differentiate-tentative-appointments
03 35955331-manuelle-zusage
07 36519961-participation-status
01 39617575-status-ändern-können-bzw-nicht-als-vorläufig-im

Please support the event status (tentative, confirmed, cancelled).

This standard feature is part of the iCalendar Core specification as per RFC 5545 3.8.1.11 (Status). Some applications such as Thunderbird Lightning and Apple iOS calender app already show the status of events. Unfortunately, it seems there is no support by Android calendar apps. Please let me know in case there is one. So, I'm wondering about this fact since the element is supported by the Google calendar API as well sync tools such as DAVx5.

Implementation of status by BC would be a stand-alone feature and USP!
BC might show tentative events in italics, cancelled events as strike-through text and confirmed ones as normal text.

Many uservoice suggestions already address this or related issues counting overall more than 60 voices (April 2020):
04 6107268-tentative-appointments
33 13836738-i-would-like-to-see-tentative-free-and-out-of-off
13 32776711-differentiate-tentative-appointments
03 35955331-manuelle-zusage
07 36519961-participation-status
01 39617575-status-ändern-können-bzw-nicht-als-vorläufig-im

Wenn ich einen Termin in Business Calendar anlege und diese über die Cloud mit Thunderbird synce, dann wird der Termin in TB als "Vorläufig" angezeigt. Es scheint, als würden alle Termine in Business Calendar den Status "Vorläufig" bekommen. Eine Funktion zum Einstellen des Status habe ich auch nicht gefunden. Hier wäre Abhilfe super.
Siehe auch: https://forums.bitfire.at/topic/1995/calendar-entries-get-status-tentative-not-confirmed

Be able to mark a diary entry as Tentative/Maybe and make it visually different so it can be differentiated i.e. striped out box in calendar of the same colour.

In google calendar the "maybe" events are with different pattern on background, please do something similiar

This would really help me too, I get a lot of invites that are marked free or tentative that are mostly informational and I won't be going to, so it's nice to easily see what things I'm busy/OOO for.

Visually differentiate appointments marked as Maybe (Tentative) on the various views of the calendar.

This would really help me at work, with the way that Exchange is used here.

+1

I wholeheartedly support this. An automatic color scheme for private events would be great, for example.

It's possible in Outlook as can be seen in this german tutorial (last post in thread):

http://www.office-loesung.de/ftopic463946_0_0_asc.php

I would like to see private, busy, tentative, free, and out of office meetings/events in a different style within the agenda or calendar views - especially in combination with Exchange accounts!

I woull recommende to have more option in the pull down menue beside available and occupied. For example out of office or not available. If I import and entry from MS Exchange account it appears.