How often should I autodiscover?

Question

We've been using the EWS SDK for a few years now and after many mistakes, we've decided it was time to refactor our code base to reflect what we've learned. One issue we see happen every once in a while is that all EWS call fails because it's pointing to a CAS that is malfunctioning. The solution seems as easy as firing off a background thread every n seconds where n represents how often we'll autodiscover.

I've scoured the web and can't seem to find any information relating to the matter.

How often should I autodiscover?

Answer 1

From the "How To: Refresh configuration information by using Autodiscover" topic on MSDN:

We recommend that you refresh your user settings by sending a new Autodiscover request after 24 hours have passed since your last Autodiscover request. This time can be adjusted to meet the requirements of your application.