I have taken over from a colleague the monitoring of a large inbox hosted on outlook 365. the inbox has accumulated about 100,000 emails. mostly the messages are from two monitoring accounts that report system up / system down sort of activity in an email.
I tried the following to no avail:
1) create rule to delete all messages from a particular address. the rule would take about 16 days to complete running inside outlook 2016
2) I sorted the inbox by the "From" and tried to delete the group of about 50,000 emails. outlook hummed along and reported that it would take about 8 minutes to process. it ran without incident, but at the end none of the emails were actually deleted out of the inbox.
any help or tips on how I might slay this demon?