To compact and back up mail folders
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Select a mail folder, click the File menu, click Folder, and then click Compact.
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To back up the compacted folders, find the files with the extensions .mbx and .idx, and then copy them to a backup folder, floppy disk, or network drive. Each message folder has one message file (.mbx) and one index file (.idx).
Notes
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Some message files might be too large to back up onto a floppy disk.
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If you are using a program other than Outlook Express to send e-mail messages to newsgroups, check your e-mail program's documentation for information about compacting and deleting mail folders.