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In page Outlook Express:

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Cancelling sending an email while it is being sent would not effectively prevent it from being sent.[1] Similarly, when importing .PST files, cancelling the import while it was in progress merely canceled the import of the current folder and the import resumed with the next folder.[citation needed] Furthermore, Outlook Express only supported .dbx files that were smaller than 2 GB, and had performance problems when dealing with files approaching that limit.[2]