How to Enable Fast Message Retrieval for an IMAP4 Virtual Server
Fast message retrieval improves performance by approximating message size, as opposed to actually calculating the message size. Performance improves because less processor work is required. You select these settings on the General tab in the Default IMAP4 Virtual Server Properties dialog box.
To enable fast message retrieval for an IMAP4 virtual server
In Exchange System Manager, navigate to the IMAP4 Virtual Server you want to configure.
In the console tree, right-click a virtual server, and then click Properties.
On the General tab, click Enable fast message retrieval to improve performance.
The General tab in the Default IMAP4 Virtual Server Properties dialog box
For More Information
Another option you can configure on an IMAP4 virtual server is to include all public folders when a folder is requested. For detailed steps, see How to Include All Public Folders When a Folder Is Requested on an IMAP4 Virtual Server.
For information about configuring and managing client protocols, see Managing Protocols.