C# EWS read 500 email accounts

Question

I need to create an application to read 500 exchange email accounts, I am using EWS and AutodiscoverUrl.

As per Microsoft documentation is a best practice cache the autodiscover response and use autodiscover for each mailbox one wants to read, I have two questions:

• For caching I am planning to use the System.Runtime.Caching dll; is it this the best approach? Can you advise on a better solution?
• Should I use autodiscover for every mailbox that I want to read, even though all they are in the same server?

PS

I'm using EWS Managed API and want to cache only the EWS URL.

Answer 1

The autodiscover response is just XML . In theory, you can cache it any number of ways (eg the AppDomain cache, Caching application block) but System.Runtime.Caching.MemoryCache seems to be the recommended in process cache for .Net 4 and up. If your are talking about a web app, I guess you might consider the HttpCache.

Regarding caching for each mailbox, I think the answer is yes. You would cache the Autodiscover endpoint information, and then invoke GetUserSettings for each mailbox, using the cached Autodiscover information.