I was recently asked to investigate an issue with importing an Excel sheet into a new SharePoint List. After trying to duplicate the problem on my lab environment I got a different error caused by my Excel 2007. After searching the web for a solution, I came across a blog post, describing the issue and giving a valid solution. The solution works and I advise you to use it when you encounter the problem J
For your convenience, I will copy the complete article in this post (you never know when blogs disappear rightJ )
Have you tried importing a Excel 2007 spreadsheet into SharePoint Service v3 and are getting a Method Post Error? Thanks to an open SharePoint forum, someone posted the fix.
I take no credit for this fix. My SharePoint hosting company is www.frontpages-web-hosting.com and on their forum is a post by Bradley Elder (Thanks Bradley!) I was able to easily apply the change mentioned in his post and can now import a spreadsheet from Excel 2007 to SharePoint Services v3.
Here is his post below:
Importing lists from Excel 2007 returns a Method ‘Post’ of object ‘IOWSPostData’ failed dialog. Again, not really a problem with WSS 3.0 but rather the result of a failed Application.SharePointVersion() call in the Excel Add-In which results in Excel attempting to use the IOWSPostData.Post() method to publish the Excel range which is used with SharePoint Team Services 1.0. By forcing the version lookup result variable to 2 or greater, Excel will use SOAP to communicate with WSS 3.0 and the publish request will be successful. To make this change, open the Excel Add-In EXPTOOWS.XLA locate in C:\Program Files\Microsoft Office\Office12\1033 by default. Press Alt+F11 to display the Visual Basic code editor and search (Ctrl+F) for the line lVer = Application.SharePointVersion(URL). Comment out that line with a single quote and add the line lVer=2 so your Intialize() method should now 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
Andrea Kalli Virtual Trainer and Assistant, LLC