| #

## About Mailbox Searches

A mailbox search discovers email messages, mailbox components (for example, meetings or contacts), and specialized items in the Exchange environment, that contain specified keywords.
The following table lists the Search & Destroy mailbox search types.

#### Mailbox Search Types

Type | Description
--- | ---
Estimate Matches | ScanMail searches the Exchange environment and returns an estimated count and an estimated size of the mailbox components that matched the search criteria. ScanMail does not copy the matched items to the discovery mailbox. Performing an estimate search allows administrators to evaluate the effectiveness of the search criteria before copying a large amount of data to the discovery mailbox. If an estimated search returns an excessively large number of matches, consider refining the search criteria to target more specific matches.
| ##### Tip Trend Micro recommends performing an estimated search before performing Search Now or Search Later. Copying large amounts of data to the discovery mailbox requires more system resources and could result in reduced performance.
Search Now | ScanMail searches the Exchange environment and copies the mailbox components that match the search criteria to the specified discovery mailbox.
Search Later | Administrators can schedule mailbox searches to run at specific times to reduce the system resource usage at peak traffic times.

Related information

- Syntax Used for Keyword Strings
- Mailbox Search Criteria