Just a quick guide on how edit an Exchange throttling policy.
First of all run “get-ThrottlingPolicy” from the Exchange Management Shell to get the name of the throttling policy and also which setting you would like to change.
Once you have got the setting you would like to edit run the following command
In my example i will be increasing the “EWSFindCountLimit” to 1500 (but just replace the name of setting and value to what you need)
Set-ThrottlingPolicy –identity “name of your policy” –EWSFindCountLimit 1500
Once you have ran the above command run “get-throttlingpolicy” again to make sure the setting has been set