To compact and back up mail folders
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Select a mail folder, click the File menu, point to Folder, and then click Compact.
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To back up the folder, find the folder file, and then copy it to a backup folder, floppy disk, or network drive. Outlook Express mail folders have a .dbx extension (for example, "Sent Items.dbx").
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.