Moving pre-installed MS Office to another drive

You can get your Office serial key by following the instructions here: Find your Office product key after installation

Alternatively any installed programs can be moved to another drive by creating a junction. Open Command Prompt as Administrator and run the commands below. The directories are for 64-bit Windows, change them as needed.

First rename the current folder for a backup:

ren "C:\Program Files (x86)\Microsoft Office" "Microsoft Office.bak"

Then copy the file to the new drive with permissions intact:

robocopy "C:\Program Files (x86)\Microsoft Office.bak" "D:\Microsoft Office" /E /ZB /DCOPY:T /COPYALL /R:1 /W:1 /V

Next, create the junction:

mklink /J "C:\Program Files (x86)\Microsoft Office" "D:\Microsoft Office"

Finally copy the permissions to the junction:

robocopy "D:\Microsoft Office" "C:\Program Files (x86)\Microsoft Office" /E /COPY:SOU /xo /xn /xc /xx

Test the program to ensure it is working and then you can delete the bakup of the original folder. Additional information on the commands used can be found here: mklink and robocopy.