I have several folders in Favorite Folders including Unread Mail and Junk
E-Mail. All was fine until recently, now every time I start Outlook 2007
the Unread Mail and Junk Mail folders disappear from Favorite folders, all
others remain.

Is there a way to prevent this happening?

Sounds like you have a corruption in your Navigation Pane. Reset it via;
Start-> Run; outlook.exe /resetnavpane

--
Robert Sparnaaij [MVP-Outlook]
Coauthor, Configuring Microsoft Outlook 2003
http://www.howto-outlook.com/
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http://www.msoutlook.info/
Real World Questions, Real World Answers

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"Jan" <jan@hotmail> wrote in message
news:836A5986-5CA7-4C1E-9B7E-D1C51BC87618@microsoft.com...
> I have several folders in Favorite Folders including Unread Mail and Junk
> E-Mail. All was fine until recently, now every time I start Outlook 2007
> the Unread Mail and Junk Mail folders disappear from Favorite folders, all
> others remain.
>
> Is there a way to prevent this happening?