Open the Exchange Management Shell as Administrator and execute the Remove-RetentionPolicy cmdlet:
Remove-RetentionPolicy "IpswitchAnalyticsRetentionPolicy"
Open the Exchange Management Shell as Administrator and execute these Remove-RetentionPolicyTag cmdlets:
Remove-RetentionPolicyTag "IpswitchAnalyticsRetentionPolicyTagInbox"
Remove-RetentionPolicyTag "IpswitchAnalyticsRetentionPolicyTagDefault"