Number of minutes that a discovery search will run before it times out. Maximum number of concurrent discovery search threads that can be active at the same time. This parameter isn’t used and will be removed. Maximum number of keywords to show statistics for on a single page in the EAC Number of items displayed on a single page in eDiscovery preview Maximum number of mailboxes for which keyword statistics are returned Maximum number of mailboxes returned in an eDiscovery search preview Maximum number of keywords in an eDiscovery search Maximum number of mailboxes searched in a single eDiscovery search. Maximum number of eDiscovery searches that can run at the same time.
Maximum number of nested distribution groups to expand when a discovery search is looking for a specified recipient. Maximum number of recipients to expand in distribution groups when a discovery search is looking for a specified recipient. Here are the eDiscovery-related settings in a throttling policy and the default values. In the Exchange Online service, it becomes even more important to cap resource consumption so other tenants in the multi-tenant environment are not impacted. In on-premises deployments, this generally happens in control of or with the knowledge of Exchange admins, who can and often do monitor server performance and undoubtedly get to hear about any performance degradation from their users. Although the searches are performed against the indexes built by Exchange Search, they can potentially consume significant system resources.
In Exchange 2013 and Exchange Online, In-Place eDiscovery allows you to search a large number of mailboxes.