For some reason, Outlook 2010 removed the separator lines that used to be present in outlook 2003, It’s not the end of the world, but to me, it is very annoying, so I went on to search and couldn’t find the answer to my problem.

Finally looking through the view settings I found the Grid Lines under Other Settings

By setting the Grid Lines to Small Dots (or whatever you like), you get the horizontal separator lines in your outlook inbox again.

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