Usually there is a decision to remove duplication within the corporation. If you were Elop next year running MS in Redmond, who would you lay off? The people in your building or those in the opposite side of the world in Finland?

Update: On a side note, manufacturing usually stays until the machines are no longer worth using. Then they shut the place down claiming inefficiencies and build a new factory somewhere else. They don't mention the lack of investment for 10 years of course.