We also imported a list  in 2007 and we had this problem so we had to fix it
in back end and we were able to import  list.

Go to c:\program Files\Microsoft Office\Office12\1033-EXPTOOWS.XLA

Open this file and fix this function

Comment this line<< 'lVer = Application.SharePointVersion(URL) '>>

Iver = 2

So your function should look like this

-------------------------------------------------------------------

Sub Initialize(List, Title, URL, QuickLaunch)

strQuickLaunch = QuickLaunch

aTarget(iPublishURL) = URL

aTarget(iPublishListName) = List

aTarget(iPublishListDesc) = Title

'lVer = Application.SharePointVersion(URL) '

lVer = 2

End Sub

After changing this file we were able to import list. Hope it helps you.

I have two follow-up questions:

1. On my server, there seems to be a file like the one you mention,
but it is in C:\program files\microsoft office\office12\1033\ and it
is called EXPTOOWS.XLA. Is this the same file as the one you mention?
It seems to have the same content. I found the function you refer to
in it.

2. The XLA file on my server is digitally signed by Microsoft. How do
you make changes to a file that is digitally signed by Microsoft? As
soon as you do, it will no longer be digitally signed. Won't that
lead to error messages when the client tries to use it?