When customizing your view press Other Settings and set the grid line style.
Additionally see
http://www.howto-outlook.com/faq/classicview2003.htm
Robert Sparnaaij [MVP-Outlook]
Coauthor, Configuring Microsoft Outlook 2003
http://www.howto-outlook.com/
Outlook FAQ, HowTo, Downloads, Add-Ins and more
Real World Questions, Real World Answers
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"Alan Rogers" <Alan Rogers@discussions.microsoft.com> wrote in message
news:0C2A3550-52CB-48DE-B85A-E2C242559E80@microsoft.com...
> Is there a way to remove the lines between each message within the summary
> pane (Inbox, Deleted, Sent...etc)? I find the lines are hard on my eyes.
> I
> feel as if I am looking at an Excel spreadsheet.