ews_response probe shows NULL values

Document ID : KB000111915
Last Modified Date : 22/08/2018
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ews_response probe is setup, but when reviewing in UMP, we're not seeing any data displayed. The raw data shows NULL values recorded for each data point.
ews_response 2.04
Monitored mailbox is full.  As the probe tests the response time by sending/receiving email, it is unable to collect measurements.
You can configure the ews_response probe to delete all items in the sent items folder to free up some space.  This is documented here:

Also, you should review the mailbox settings for size and retention of email to ensure that the inbox doesn't get full due to normal ews_response use.