Unexpected error occurred when a user run New-MailboxSearch in Exchange Server 2013

Applies to: Exchange Server 2013 EnterpriseExchange Server 2013 Standard Edition


Assume that the Client Throttling policy is configured, and that DiscoveryMaxMailboxes is set to Unlimited in Microsoft Exchange Server 2013. In this situation, when a user who falls under Client Throttling policy tries to run the New-MailboxSearch cmdlet, the following error message is received:

WARNING: An unexpected error has occurred and a Watson dump is being generated: No value.
VERBOSE: [17:51:41.571 GMT] New-MailboxSearch : Admin Audit Log: Entered Handler:OnComplete.
No value.


This is a known issue in Exchange Server 2013.


To work around this issue, configure DiscoveryMaxMailboxes to have a numeric value in the throttling policy.