Author: Michael A. Silver (Gartner Research G00200621 from 28 May 2010 )
“It’s important to determine how much it will cost to move from an organization’s current office productivity suite to a future one, such as the next version of Microsoft Office or an open-source alternative. This research provides a guide and a model to enable organizations to project migration costs for both scenarios.”
for more details: https://www.gartner.com/en/documents/1377313