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copy and queue length and ews

Yogesh_Exchange_Expert asked
what is copy and queue length and exchange web services in exchange.
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Exchange Experts
Copy queue length (logs) - (CQL)  Indicates the number of log files waiting to be copied and inspected.

Exchange Web Services (EWS) provides the functionality to enable client applications to communicate with the Exchange server. EWS provides access to much of the same data that is made available through Microsoft Office Outlook. EWS clients can integrate Outlook data into Line-of-Business (LOB) applications. SOAP provides the messaging framework for messages sent between the client application and the Exchange server. The SOAP messages are sent by HTTP.