Note You cannot index attachments in Exchange Public Folders.
Select the information stores containing the folders that you want to index.
Click the OK button to immediately begin the indexing process. You can continue to work in Outlook while the Index is being built.
Delete existing index and rebuild This can take a while, so you only use this option if you believe the existing index is corrupt or incomplete.Open the Scheduled Tasks dialog to schedule automatic attachment indexing.
To view data about the last index open the Index Information dialog.