"""
LIMITATIONS ON REVERSE ENGINEERING, DECOMPILATION, AND DISASSEMBLY. You may not
reverse engineer, decompile, or disassemble the Software, except and only to the extent that such activity is expressly
permitted by applicable law notwithstanding this limitation.
"""
Have you actually looked up those laws to know if what you're doing is legal? Would you be willing to bet on your ability to interpret legal code? I sure haven't and sure wouldn't. I'm not interesting in putting myself in a position where I might have to fight Microsoft in a legal battle. I can already tell you who will win that one. Billions of dollars almost always wins.
Also, if there is a bug in Excel that you find problematic, there's nothing at all you can do about it except stop using Excel. If you're using open source, you can fix it and get on with your work.
The author also points to an issue that existed with Debian for about 2 years. In open source terms, that's an extremely long lived bug. If security is a huge issue for you (and it isn't for most computer use cases), use open bsd, where security bugs are fixed almost immediately. Even so, I have to ask, how long is the longest a security hole has remained open in Windows (that's assuming you don't consider Windows itself a security hole, and I'm not sure you can be so generous)? How would you even know? Do you think Microsoft is going to tell you, "Oh yeah, we had this huge security bug for about 10 years that we finally fixed up?"
Finally, the author is attacking a straw man anyway:
"""
I only resist the open-source fundamentalism, that defines every proprietary software as inherently insecure, and everything open source as ultimately secure.
"""
Who actually think that everything open source is automatically secure? No one. Here's some open source code for backing up your computer: "rm -rf /". Show of hands, who thinks this is secure system backup software?
(Just in case you don't know any better, DO NOT FOR ANY REASON RUN "rm -rf /" ON A UNIX-BASED MACHINE.)
The argument that people actually make is that open source software has a tendency to be more secure... that the culture is more inclined to produce secure software. If you attack that instead of a straw man, you'll have a much harder time.
