The instructions below show how to search an Outlook mailbox for all EnterpriseVault items using the "Message Class" value.
The steps are specific to Outlook 2010, but would be similar in earlier versions of Outlook.
Note 1: This technique works within my environment. Test to ensure accuracy of this search technique in your own environment.
Note 2: In step 5 of the search, enter different search "Value" to search for items of a different "Message Class".
Procedure
1. In Outlook, Open “Advanced Find” by keying Ctrl + Shift + F
Or …
By menu Home > Filter E-mail > More Filters… In the “Search Tools” menu that appears, click on Search Tools button, then select Advanced Find
2. In the “Advanced Find” window that appears, select the “Advanced” tab.
3. In the “Look For” section, select “Any type of Outlook Message”.
4. For the “In” field, click on the Browse… button.
In the “Select Folder(s)” window that appears, select the top level folder (Usually identified as the user’s email address or mailbox name)
Below the list of folders, select the check box for “Search subfolders” (so that the check appears in the check box).
Click on the OK button to save changes in the “Search Folder(s)” window.
5. In the “Define more criteria” section of “Advanced Find” window, click on the Field menu and select All Mail Fields > Message Class
In the “Conditions” field, select Contains.
In the “Value” field, enter text “EnterpriseVault”
Click on the Add to List button.
6. Click on the Find Now button to locate EnterpriseVault items.
Expected Result
A list of mailbox items with "Message Class" of "EnterpriseVault".