Mail will not open main window

I just upgraded to Leopard from Tiger. Everything seems to be working except for Mail... sort of. When I open Mail I do not see the main mail Window. I can see the Mail menus at the top and I went to Window -> Message Viewer. But I do not see my mailboxes etc. Any ideas what went wrong?

Scott,
If you Upgraded from 10.4.11 or earlier to Leopard 10.5.6, it is probably what has been covered by the support document at the link below:
http://support.apple.com/kb/TS2537
If you also find any files named to include MessageSorting (which would mean you once have upgraded from a version of OSX earlier than 10.4), remove those, also, but never restore those.
To find the correct location for the Mail folder, open a Finder window, click on the icon of a house in the Sidebar (this is known often as "Home"), click on Library in that Home user directory, and then to open the Mail folder found there.
Ernie

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~/Library/Mail/Bundles
Right-click or control-click the highlighted line and select
          Services ▹ Open
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2. Repeat with this line:
/Library/Mail/Bundles
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Mail will not open main window

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