Top Definition
The blue line which appears on the left of the text pane when composing replies in Microsoft Outlook. It is continuous and so cannot be used to distinguish a series of quotes from the original text from the reply text. Nor can it be entirely deleted, as any attempt to do so will leave a one-character sized stub.
What is Microsoft's explanation for the blue line of evil?
by goldkillreturns April 28, 2009

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