Millimeters and Points

Excel
There are no Methods.

Word
There is a MillimetersToPoints method

Dim sngPoints As Single 
sngPoints = Application.MillimetersToPoints(10) 

There is a PointsToMillimeters method

Dim sngMillimeters As Single 
sngMillimeters = Application.PointsToMillimeters(10) 

PowerPoint
There are no Methods.