Consider the following scenario:
- Your primary mailbox is located on an on-premises server in a Microsoft Exchange Server 2010 hybrid environment.
- Your archive mailbox is located in Microsoft Office 365 Exchange Online.
- You perform an eDiscovery search for the on-premises mailbox.
An error occurred when searching Mailbox user's Display Name. The message is 'Exchange Web Service call for keywords statistics information failed. Error: The specified object was not found in the store.'