The Ipswitch Analytics Exchange Mailbox is used as a persistent work-queue for the Ipswitch Analytics Exchange Agent. The Ipswitch Analytics Mailbox Retention Policy is configured so that Exchange never deletes items from the Mailbox that have aged-out because of a retention policy.
Reference: Microsoft TechNet
New-RetentionPolicyTag -Name "IpswitchAnalyticsRetentionPolicyTagInbox" -Type Inbox -RetentionAction DeleteAndAllowRecovery -RetentionEnabled $false
New-RetentionPolicyTag -Name "IpswitchAnalyticsRetentionPolicyTagDefault" -Type All -RetentionAction DeleteAndAllowRecovery -RetentionEnabled $false
New-RetentionPolicy "IpswitchAnalyticsRetentionPolicy" -RetentionPolicyTagLinks "IpswitchAnalyticsRetentionPolicyTagInbox","IpswitchAnalyticsRetentionPolicyTagDefault"