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event resource type

Namespace: microsoft.graph

Important

APIs under the /beta version in Microsoft Graph are subject to change. Use of these APIs in production applications is not supported. To determine whether an API is available in v1.0, use the Version selector.

An event in a user calendar, or the default calendar of a Microsoft 365 group.

The maximum number of attendees included in an event, and the maximum number of recipients in an eventMessage sent from an Exchange Online mailbox is 500. For more information, see sending limits.

This resource supports:

Note: There are a few minor differences in the way you can interact with user calendars, group calendars, and their events:

  • You can organize only user calendars in a calendarGroup.
  • You can add attachment objects to events in only user calendars, but not to events in group calendars.
  • Outlook automatically accepts all meeting requests on behalf of groups. You can accept, tentatively accept, or decline meeting requests for user calendars only.
  • Outlook doesn't support reminders for group events. You can snooze or dismiss a reminder for user calendars only.

Methods

Method Return Type Description
List events Event collection Retrieve a list of event objects in the user's mailbox. The list contains single instance meetings and series masters.
Create event event Create a new event by posting to the instances collection.
Get event event Read properties and relationships of event object.
Update event event Update event object.
Delete event None Delete event object.
Get delta event collection Get a set of events that have been added, deleted, or updated in a calendarView (a range of events) of the user's primary calendar.
Forward event None Lets the organizer or attendee of a meeting event forward the meeting request to a new recipient.
Cancel event None Send cancellation message from the organizer to all the attendees and cancel the specified meeting.
Accept event None Accept the specified event in a user calendar.
Tentatively accept None Tentatively accept the specified event in a user calendar.
Decline event None Decline invitation to the specified event in a user calendar.
Dismiss reminder None Dismiss the reminder for the specified event in a user calendar.
Snooze reminder None Postpone a reminder for the specified event in a user calendar until a new time.
List event instances Event collection Get a Event object collection.
Attachments
List attachments Attachment collection Get all attachments on an event.
Add attachment Attachment Add a new attachment to an event by posting to the attachments collection.
Open extensions
Create open extension openTypeExtension Create an open extension and add custom properties to a new or existing resource.
Get open extension openTypeExtension collection Get an open extension identified by the extension name.
Extended properties
Create single-value property event Create one or more single-value extended properties in a new or existing event.
Get single-value property event Get events that contain a single-value extended property by using $expand or $filter.
Create multi-value property event Create one or more multi-value extended properties in a new or existing event.
Get multi-value property event Get an event that contains a multi-value extended property by using $expand.

Properties

Property Type Description
allowNewTimeProposals Boolean true if the meeting organizer allows invitees to propose a new time when responding; otherwise, false. Optional. Default is true.
attendees Attendee collection The collection of attendees for the event.
body ItemBody The body of the message associated with the event. It can be in HTML or text format.
bodyPreview String The preview of the message associated with the event. It is in text format.
categories String collection The categories associated with the event. Each category corresponds to the displayName property of an outlookCategory defined for the user.
changeKey String Identifies the version of the event object. Every time the event is changed, ChangeKey changes as well. This allows Exchange to apply changes to the correct version of the object.
createdDateTime DateTimeOffset The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z
end DateTimeTimeZone The date, time, and time zone that the event ends. By default, the end time is in UTC.
hasAttachments Boolean Set to true if the event has attachments.
hideAttendees Boolean When set to true, each attendee only sees themselves in the meeting request and meeting Tracking list. Default is false.
iCalUId String A unique identifier for an event across calendars. This ID is different for each occurrence in a recurring series. Read-only.
id String Unique identifier for the event. By default, this value changes when the item is moved from one container (such as a folder or calendar) to another. To change this behavior, use the Prefer: IdType="ImmutableId" header. See Get immutable identifiers for Outlook resources for more information. Case-sensitive and read-only.
importance String The importance of the event. The possible values are: low, normal, high.
isAllDay Boolean Set to true if the event lasts all day. If true, regardless of whether it's a single-day or multi-day event, start and end time must be set to midnight and be in the same time zone.
isCancelled Boolean Set to true if the event has been canceled.
isDraft Boolean Set to true if the user has updated the meeting in Outlook but has not sent the updates to attendees. Set to false if all changes have been sent, or if the event is an appointment without any attendees.
isOnlineMeeting Boolean True if this event has online meeting information (that is, onlineMeeting points to an onlineMeetingInfo resource), false otherwise. Default is false (onlineMeeting is null). Optional.
After you set isOnlineMeeting to true, Microsoft Graph initializes onlineMeeting. Subsequently Outlook ignores any further changes to isOnlineMeeting, and the meeting remains available online.
isOrganizer Boolean Set to true if the calendar owner (specified by the owner property of the calendar) is the organizer of the event (specified by the organizer property of the event). This also applies if a delegate organized the event on behalf of the owner.
isReminderOn Boolean Set to true if an alert is set to remind the user of the event.
lastModifiedDateTime DateTimeOffset The Timestamp type represents date and time information using ISO 8601 format and is always in UTC time. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z
location Location The location of the event.
locations Location collection The locations where the event is held or attended from. The location and locations properties always correspond with each other. If you update the location property, any prior locations in the locations collection would be removed and replaced by the new location value.
onlineMeeting OnlineMeetingInfo Details for an attendee to join the meeting online. Default is null. Read-only.
After you set the isOnlineMeeting and onlineMeetingProvider properties to enable a meeting online, Microsoft Graph initializes onlineMeeting. When set, the meeting remains available online, and you cannot change the isOnlineMeeting, onlineMeetingProvider, and onlneMeeting properties again.
onlineMeetingProvider onlineMeetingProviderType Represents the online meeting service provider. By default, onlineMeetingProvider is unknown. The possible values are unknown, teamsForBusiness, skypeForBusiness, and skypeForConsumer. Optional.
After you set onlineMeetingProvider, Microsoft Graph initializes onlineMeeting. Subsequently you cannot change onlineMeetingProvider again, and the meeting remains available online.
onlineMeetingUrl String A URL for an online meeting. The property is set only when an organizer specifies in Outlook that an event is an online meeting such as Skype. Read-only.
To access the URL to join an online meeting, use joinUrl which is exposed via the onlineMeeting property of the event. The onlineMeetingUrl property will be deprecated in the future.
organizer Recipient The organizer of the event.
originalEndTimeZone String The end time zone that was set when the event was created. A value of tzone://Microsoft/Custom indicates that a legacy custom time zone was set in desktop Outlook.
originalStart DateTimeOffset Represents the start time of an event when it is initially created as an occurrence or exception in a recurring series. This property is not returned for events that are single instances. Its date and time information is expressed in ISO 8601 format and is always in UTC. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z
originalStartTimeZone String The start time zone that was set when the event was created. A value of tzone://Microsoft/Custom indicates that a legacy custom time zone was set in desktop Outlook.
recurrence PatternedRecurrence The recurrence pattern for the event.
reminderMinutesBeforeStart Int32 The number of minutes before the event start time that the reminder alert occurs.
responseRequested Boolean Default is true, which represents the organizer would like an invitee to send a response to the event.
responseStatus ResponseStatus Indicates the type of response sent in response to an event message.
sensitivity String Possible values are: normal, personal, private, confidential.
seriesMasterId String The ID for the recurring series master item, if this event is part of a recurring series.
showAs String The status to show. Possible values are: free, tentative, busy, oof, workingElsewhere, unknown.
start DateTimeTimeZone The start date, time, and time zone of the event. By default, the start time is in UTC.
subject String The text of the event's subject line.
transactionId String A custom identifier specified by a client app for the server to avoid redundant POST operations in case of client retries to create the same event. This is useful when low network connectivity causes the client to time out before receiving a response from the server for the client's prior create-event request. After you set transactionId when creating an event, you cannot change transactionId in a subsequent update. This property is only returned in a response payload if an app has set it. Optional.
type String The event type. Possible values are: singleInstance, occurrence, exception, seriesMaster. Read-only
webLink String The URL to open the event in Outlook on the web.

Outlook on the web opens the event in the browser if you are signed in to your mailbox. Otherwise, Outlook on the web prompts you to sign in.

This URL cannot be accessed from within an iFrame.

Note

The webLink property specifies a URL that opens the event in only earlier versions of Outlook on the web. The following is its URL format, with {event-id} being the URL-encoded value of the id property:

  • For work or school accounts: https://outlook.office365.com/owa/?itemid={event-id}&exvsurl=1&path=/calendar/item

  • For Microsoft accounts: https://outlook.live.com/owa/?itemid={event-id}&exvsurl=1&path=/calendar/item

To open the event in a current version of Outlook on the web, convert the URL to one of the following formats, and use that URL to open the event:

  • For work or school accounts: https://outlook.office365.com/calendar/item/{event-id}

  • For Microsoft accounts: https://outlook.live.com/calendar/item/{event-id}

Relationships

Relationship Type Description
attachments Attachment collection The collection of FileAttachment, ItemAttachment, and referenceAttachment attachments for the event. Navigation property. Read-only. Nullable.
calendar Calendar The calendar that contains the event. Navigation property. Read-only.
extensions Extension collection The collection of open extensions defined for the event. Nullable.
instances Event collection The occurrences of a recurring series, if the event is a series master. This property includes occurrences that are part of the recurrence pattern, and exceptions that have been modified, but does not include occurrences that have been cancelled from the series. Navigation property. Read-only. Nullable.
multiValueExtendedProperties multiValueLegacyExtendedProperty collection The collection of multi-value extended properties defined for the event. Read-only. Nullable.
singleValueExtendedProperties singleValueLegacyExtendedProperty collection The collection of single-value extended properties defined for the event. Read-only. Nullable.

JSON representation

The following JSON representation shows the resource type.

{
  "allowNewTimeProposals": "Boolean",
  "attendees": [{"@odata.type": "microsoft.graph.attendee"}],
  "body": {"@odata.type": "microsoft.graph.itemBody"},
  "bodyPreview": "string",
  "categories": ["string"],
  "changeKey": "string",
  "createdDateTime": "String (timestamp)",
  "end": {"@odata.type": "microsoft.graph.dateTimeTimeZone"},
  "hasAttachments": true,
  "hideAttendees": false,
  "id": "string (identifier)",
  "importance": "String",
  "isAllDay": true,
  "isCancelled": true,
  "isDraft": false,
  "isOnlineMeeting": true,
  "isOrganizer": true,
  "isReminderOn": true,
  "lastModifiedDateTime": "String (timestamp)",
  "location": {"@odata.type": "microsoft.graph.location"},
  "locations": [{"@odata.type": "microsoft.graph.location"}],
  "onlineMeeting": {"@odata.type": "microsoft.graph.onlineMeetingInfo"},
  "onlineMeetingProvider": "string",
  "onlineMeetingUrl": "string",
  "organizer": {"@odata.type": "microsoft.graph.recipient"},
  "originalEndTimeZone": "string",
  "originalStart": "String (timestamp)",
  "originalStartTimeZone": "string",
  "recurrence": {"@odata.type": "microsoft.graph.patternedRecurrence"},
  "reminderMinutesBeforeStart": 1024,
  "responseRequested": true,
  "responseStatus": {"@odata.type": "microsoft.graph.responseStatus"},
  "sensitivity": "String",
  "seriesMasterId": "string",
  "showAs": "String",
  "start": {"@odata.type": "microsoft.graph.dateTimeTimeZone"},
  "subject": "string",
  "type": "String",
  "webLink": "string",

  "attachments": [ { "@odata.type": "microsoft.graph.attachment" } ],
  "calendar": { "@odata.type": "microsoft.graph.calendar" },
  "extensions": [ { "@odata.type": "microsoft.graph.extension" } ],
  "instances": [ { "@odata.type": "microsoft.graph.event" }],
  "singleValueExtendedProperties": [ { "@odata.type": "microsoft.graph.singleValueLegacyExtendedProperty" }],
  "multiValueExtendedProperties": [ { "@odata.type": "microsoft.graph.multiValueLegacyExtendedProperty" }]
}