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ArcToolbox Project wizard does not display geographic transformations (datum) when trying to reproject shapefiles or geodatabase feature classes, when one or more are known to exist.
The geographic coordinate system of the input data doesn't match the equivalent geographic coordinate system for the predefined geographic transformations.
This issue has been addressed in ArcGIS Version 8.1.2.
In ArcMap 8.1.1, reproject the data on-the-fly: