I can't say for certain, but generally speaking "no". The export to Excel does not include that. However, you can export other aspects of the task/summary (milestone flag, for instance) and set up conditional formatting in Excel to do what you want. However, I think you would need to do that each time you export to Excel; maybe not - I'm no Excel guru.
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The trouble with doing something right the first time is that nobody appreciates how difficult it was - Steven Wright