Hi Jorgen,
Unfortunately, you cannot create an S-curve directly in MS Project.
However, you can use the "Analyze Timescaled Data" feature to export the
data to Excel. This will produce the results you are looking for. Also, if
you use Project Server, you can generate S-Curves using the Portfolio
Analyzer.
To use the Export feature, go to "View->Toolbars->Customize..." In the
"Toolabars" tab, click the checkbox next to "Analysis" and close the window.
A new set of icons should have appeared in MS Project. Click the "Analyze
Timescaled Data in Excel..." button and follow the steps to export the data
you need to create the S-curve.
-Bill