In creating an event on the calendar, sometimes it would be nice to attach a file or a scanned invitation, etc.

Grew,blue,green what was the color for my important meetings? Lets add names on the colors so you can call for example:

green = meeting red = birthday of my girlfriend etc.................

I have difficulty with my videoconference appointments because many times the meeting ID/passwords are not shown on the appointment. It would be great to be able to join directly by clicking on the appointment on the calendar

When editing a repeating events, please add the option to edit “this and future occurrences” in addition to editing the entire series. The reason this is important is because it allows the user to maintain an accurate record of past appointments but still alter the series in the future. Without this, you can only edit the entire series, which alters past appointments as well. This is problematic when I, as a healthcare professional, need to refer to past events when conflicts or disagreements occur with patients regarding past events.

multiple reminders for a single event (like google does)

Dear Sir/Madam, I am writing to express my appreciation for the quality of your app. Thank you for creating such a useful tool. I have a request. As I come from Ethiopia, I would like to suggest adding the Ethiopian calendar system in addition to the Gregorian calendar system that is currently available on the app. Is it possible for you to consider this request? Thank you for your time and attention. Best regards.

OneCalendar has no provision for setting free / busy / etc. conditions when creating a calendar item. some appointments need this, in which case I usually create the item in OneCalendar then open Outlook.com to edit the calendar item for busy etc.

Could we please have this added to 1C (and the option to set a default value).

When you get a reminder notification you should be able to press a sleep button on the notification. So that you are able to close the notification when you are in hurry or in the end of a meeting. After a couple of minutes OneCalendar should remind me again. Like a snooze button on an alarm clock. 

When I create an event and then I want to change the calendar to which it was attached (e.g. "personal" -> "work"), I am unable to do it in Windows. In Android app it is possible, but in Windows I have to delete this event and create a new one with the proper calendar attached (or edit this event on my Android phone...).

It would be cool if I could do a faster change of an event's color, like by right-clicking on the event and seeing the color palette right there from which I can choose the new color.

More colours to choosewould be nice,cause ts to less colours once in a while

Like in the android app, it would be highly apprecheated if one could adjust the time zone of the start and end timing of an event (individually, due to e.g. flights). This works perfectly in android and was one of the reasons also to install the windows app.

Set an event as private. I often send calendar invites to my work email address (which uses Outlook), and designating the event as private prevents coworkers from seeing the text of the event (though they can still see I have the time blocked off). Google Calendar has this feature as well.

Repeating others suggestions of snooze for reminders. Thunderbird has it, replaced TBird with 1C. That would be a definite reason to go "premium"

Vertical scrolling is an application standard that has existed for multiple generations of computer software, and mimics real-life interactions with the one of the most common forms of calendar (the spiral-bound one hanging on fridges the world over.)

Yet OneCalendar scrolls sideways. This breaks convention and is counter-intuitive, especially since weeks and days both allow vertical scrolling. Changing this - or at least adding the option - to scroll vertically would be much appreciated. Additionally, if the application did not force one to "stop" on months in month view mode, it would make scheduling appointments near the end of a month,

Sometimes I may want to have a link to a website in the description or even an application link that pulls up something in another app, usually formatted like app_name://x-callback-url/action_name?id=87170e427bfe4a94b21160ec35c86cd3

Drag and drop events.

If you create a repeating event, then attempt to edit you can only edit the individual appointment not the series.

Seria excelente poder agregar multiples reminders. Ahora solo deja uno. gracias.