DRGimlin

I came across this issue when I tried to use MSO 2010 on my XP machine for the first time in years, which makes the fix much harder. I can live without Office on my XP machine, but pursued a fix as a "fun" exercise. Thought this might help someone else. As mentioned earlier in the thread, you'll need to remove all MSO updates after KB4092483. Fortunately, the numbers ascend by date. Using add/remove programs, I removed all MSO application updates after KB4092483. Try running an Office application. If you get the same or similar error, you're not done yet. Restart your machine and add/remove programs. You'll probably discover that updates after KB4092483 have magically reappeared. Remove them. Between iterations of this process, I also tried installing the KB4092483. At first, I got some obscure error message that I didn't write down, but I was successful after restarting the computer. I don't know if running this update several times contributed to the process. As I iterated, the date stamp and version number of mso.dll changed, getting closer to 9/14/18 and 14.0.7214.5000 And finally, eureka! After backing this up, I incrementally added updates to see what breaks Office. My observation is that it was only the security updates. Replacing mso.dll with the 14.0.7214.5000 version allows Office applications to start, but I did not test extensively. This likely defeats the security fixes, so best not to connect such a machine to the internet.