I have used MS Office a long time. Other specialty products as well, but still Excel and Word has been mainstays.
I did not move from MS-XP to MS-Vista or to MS-7 which my wife has and though MS-7 is not too bad I still have no reason to upgrade OSs.
Occasionally I am asked questions about how to use the Office for MS-7 so I am enough familiar with it to decide that I will stay with the older version.
This "one unmovable license" is another reason to gradually move away from MS Office.