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The default for the "IMAP server returns exact size of message" field on the Configuration Settings document is set to "enabled." If non-MIME messages are being handled by the IMAP server requiring exact message size, the server must convert every message to MIME just to display its summary information. Therefore, Lotus strongly recommends that you disable this field for performance purposes if you are using clients that work with an estimated message size. If you are using Netscape Navigator 4.5 and above or Pine as a browser, you need to use the default.