Originally this script ( New-ComplianceSearch script ) would search through Purged Items. That was the downside of it comparing to a "classic" Search-Mailbox you can find here ( Search-Mailbox script ). So imagine you run the script the 1st time, find target messages, and then delete them - the found results make sense. However, should you run the script the 2nd time with the same search criteria, it would find those already purged messages again. That creates some confusion. So it would be great to exclude Purged Items folders from the search. Now, it is possible to do so on the fly ( https://docs.microsoft.com/en-us/microsoft-365/compliance/use-content-search-for-targeted-collections ) but it is very time consuming and takes about 1-3 seconds for each mailbox which stacks up pretty fast. So I came up with a script to take care of this issue by storing a Purged Items FolderID in a CustomAttribute10 of each mailbox. So…