Next and Previous links in email

Is there a way to turn off the Next and Previous links that occur in an email thread in Outlook 2007?
(i.e. when multiple people have replied or forwarded the message, how it lets you jump between messages)

That is a new option in Outlook 2007 which is linked to message header shading. To toggle it on/off go to;
Tools-> Options…-> E-mail Options…-> Shade message headers when reading mail

In Outlook 2010 you can find this option by going to;
File-> section Options-> section Mail-> option group Other (at the bottom)-> Shade message headers when reading messages

Next and Previous in message header
For the top message the option shows First and Previous.
For the bottom message the option shows Next and Last.

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