| Name | Description |
 | ActivityType | Gets the ActivityType of this activity. |
 | Categories | Specifies categories associated with this activity as a comma separated list of category id's. |
 | DataItem | Gets the underlying data item if any. |
 | Description | Gets or sets the text associated with this activity. |
 | Duration | Gets the duration of the activity. |
 | End | Specifies the time in UTC when the activity ends. |
 | EndTimeZoneId | The time-zone id associated with the activity. The Start and End times are always in UTC. |
 | Error | Gets or sets the error if any associated with the activity. |
 | Id | Gets or sets the appointment Id. |
 | IsLocked | Specifies whether the activity can be modified in the UI. |
 | IsOccurrence | Returns true if the ActivityBase is an occurrence of a recurring ActivityBase (read only). |
 | IsOccurrenceDeleted | Gets or sets a value indicating whether the occurrence has been deleted. |
 | IsRecurrenceRoot | Returns true if the ActivityBase is a recurring ActivityBase with a define set of RecurrenceBase rules (read only). |
 | IsTimeZoneNeutral | Specifies whether the activitiy's times are time-zone neutral or "floating". |
 | IsVariance | Gets or sets a value indicating if the activity is a variance of an occurrence. |
 | IsVisible | Gets or sets whether the activity is visible. |
 | IsVisibleResolved | Gets the resolved value indicating whether the activity is visible. |
 | LastModifiedTime | Gets or sets the time in UTC when the activity was last modified. |
 | MaxOccurrenceDateTime | A date-time value that's equal or greater than the date-time of the last occurrence of the recurring activity. |
 | Metadata | Returns a MetadataPropertyValueStore object that's used for storing and retrieving metadata information. |
 | OriginalOccurrenceEnd | Only applies to occurrences of a recurring activity. Specifies the original date-time as it was generated by the recurrence. |
 | OriginalOccurrenceStart | Only applies to occurrences of a recurring activity. Specifies the original date-time as it was generated by the recurrence. |
 | OwningCalendar | Gets or sets the calendar to which this activity belongs. |
 | OwningCalendarId | Gets or sets the id of the calendar to which this activity belongs. |
 | OwningResource | Gets or sets the owning resource. |
 | OwningResourceId | Gets or sets the owning resource id. |
 | Recurrence | Specifies recurrence rules. |
 | RecurrenceVersion | Specifies the recurrence version. |
 | Reminder | Specifies the reminder information. Default value is null. |
 | ReminderEnabled | Specifies whether the activitiy's reminder is enabled. Default value is false. |
 | ReminderInterval | Specifies the reminder interval. |
 | RootActivity | Gets the root activity. Only valid if this activity is an occurrence or a variance of a recurring activity. |
 | RootActivityId | If this activity is an occurrence or a variance of a recurring activity, gets the id of the recurring activity. |
 | Start | Specifies the time in UTC when the activity starts. |
 | StartTimeZoneId | The time-zone id associated with the activity. The Start and End field values are always in UTC. |
 | Subject | Gets or sets the subject associated with this activity. |
 | VariantProperties | Properties of a variance that have been modified and thus will not be synchronized with the root activity. |