EWS API – Error when recreating notification subscriptions

Given the documentation at: https://msdn.microsoft.com/en-us/library/office/dn458788(v=exchg.150).aspx When a subscription is lost, or is no longer accessible, it is best to create a new subscription and not include the old watermark in the new subscription. Resubscribing with the old watermark causes a linear scan for events, which is costly. Instead, create a new subscription and compare folder … Read more