The Message Indexing dialog is used for the configuration of real-time and nightly maintenance of the search indexes used by Webmail, ActiveSync, and Remote Administration.
Daily Maintenance Options
The options in this section govern nightly search indexing.
Maintain search indexes in mailboxes
Check this box if you wish to maintain search indexes in your mailbox folders. You can choose to do this for either Inboxes only or for all mail folders.
Maintain search indexes in public folders
Enable this option if you wish to maintain search indexes in your public folders. You can also specify a maximum number of threads that will be allowed to work on this simultaneously.
Real-Time Indexing
Index messages in Mailboxes
Enable this option if you wish to perform real-time search indexing in Mailboxes, so that search indexes are always up to date.
Index messages in Public Folders
Check this box if you wish to do real-time search indexing of Public Folders.
Cluster Options
If using Clustering, use the options is this section to designate the cluster nodes that will be dedicated to daily indexing maintenance and real-time indexing.