The Content and Attachments gathering tasks collect information about the email content and attachments in your Exchange organization.
Note: These gatherings can consume a large amount of processing capacity and memory to gather data, and use a large amount of database space to store data. It is recommended that you select 10 mailboxes or less. If you select more than 10 mailboxes, performance can be seriously affected and the MessageStats database can grow substantially. The average recommended mailbox size is 200 MB. If you want to select more than 10 mailboxes, it is recommended that you create the gathering with batches of 5-10 mailboxes.
Note: The account which is used to run a Content and Attachments Mailbox gathering must have Full Mailbox Access to the specific mailbox or to all mailboxes from which you want to gather the content and attachment information.
To create an Exchange Mailbox Content and Attachments gathering: