UserMailboxMustHaveRegex

A regular expression to restrict the Exchange Online mailboxes that are processed. A mailbox is not processed unless it matches the regular expression. This parameter is used only when you set CrawlExchangeOnlineMailboxes to true.

Type: String (regular expression)
Default:  
Required: No
Configuration Section: TaskName or FetchTasks
Example: UserMailboxMustHaveRegex=user@\.domain\.com
See Also:

CrawlExchangeOnlineMailboxes

ExchangeOnline