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BaseSubscriptionRequestType.Watermark Property

The Watermark property gets or sets an event bookmark in the mailbox events table.

Namespace:  ExchangeWebServices
Assembly:  EWS (in EWS.dll)

public string Watermark { get; set; }

Property Value

Type: System.String
The Watermark property returns a string that represents an event bookmark.

The Watermark property is used to create a subscription that starts at an event that is represented by the watermark. If the watermark from a Subscribe request is not found, an error response will be returned to the client. This error may occur if the watermark is older than 30 days or if the watermark was never present in the mailbox.