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Solved: How do I delete Discovery mailbox and Health mailbox in Exchange Database?


We have recently migrated to Office 365 in a Hybrid environment. We’re are now in the process of decommissioning the on-premises Exchange Servers. We urgently need to reclaim the storage the mailbox databases are using. We have two discovery mailboxes and 69 health mailboxes running on the entire estate.

  • Question 1: Are the health mailboxes safe to delete on the database?
  • Question 2: Could I take the DB offline and delete?
  • Question 3: What is the safest way to delete some of these databases?
  • Question 4: What is the best way to delete discovery search mailboxes?


You can delete the health mailbox by the following command: Get-Mailbox -database databasename -Monitoring | Remove-Mailbox

Or you can even delete the health mailboxes accounts from ADUC.

Execute below command to delete discovery search mailboxes: Get-Mailbox DiscoverySearchMail* | Remove-Mailbox

Or move to another database if you have one: Get-Mailbox DiscoverySearchMail* | New-MoveRequest -TargetDatabase "DatabaseName"

Alex Lim is a certified IT Technical Support Architect with over 15 years of experience in designing, implementing, and troubleshooting complex IT systems and networks. He has worked for leading IT companies, such as Microsoft, IBM, and Cisco, providing technical support and solutions to clients across various industries and sectors. Alex has a bachelor’s degree in computer science from the National University of Singapore and a master’s degree in information security from the Massachusetts Institute of Technology. He is also the author of several best-selling books on IT technical support, such as The IT Technical Support Handbook and Troubleshooting IT Systems and Networks. Alex lives in Bandar, Johore, Malaysia with his wife and two chilrdren. You can reach him at [email protected] or follow him on Website | Twitter | Facebook

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