Stop Office BACKUP THIS DOCUMENT prompt

My problem with LibreOffice and the other open source versions of Office is the outright thievery involved. I'm sure MS didn't spend millions (billions?) on developing Office over the years just for a bunch of basement coders to rip off their IP and build an exact copy.

"Open source" means anyone can look at the code. If Microsoft saw ripped-off code, they'd do what most companies do: sue like hell. That's true of all open source. LibreOffice's macro language isn't VBA because they don't have a license for it; LibreOffice often can't even convert VBA to its own macro language without loss, and the help community recommends just starting over. The fact that LibreOffice etc has similar functionality and appearance is meaningless: all word processors have to do pretty much the same thing, and if they want to stay competitive they'll try to keep up with new features. They also want to make switching fairly easy, which is aided by similar appearance. (LibreOffice actually defaults to a different appearance, and you have to find the option for ribbons if you want that.)

Incidentally, sometimes companies release their proprietary code into open source. Sun Microsystems owned the suite StarOffice, which they made open source, and that became the basis of several successors, including LibreOffice. Likewise, Google made the basic browser engine behind Chrome open source in the form of Chromium, which numerous browsers now use (including Microsoft's Edge). That's another situation in which similarity doesn't mean theft.

In short, your accusation of theft is simply false.

I'm not particularly eager to change from MS 365, but like the other people in this thread, I'm very frustrated by MS's implementation of OneDrive and now the coming increased subscription fee. So I'm examining options.

Just uninstall OneDrive and change Word/Excel settings to always put everything in local documents folder.

I have done that on all PCs here, and don't miss OneDrive at all. The cloud storage is still there if I need to use it for sharing large files, etc.

This is hardly a solution. It's not even a workaround unless you have no cloud plans at all.

OneDrive is (well, was) quite an elegant cloud solution until MS got all control freak and decided to make it try to do %*^$# everything. Doesn't seem to be possible to set it to just be there for you to save stuff to at your own discretion - the moment it's there, it wants control over your home folders, your "save" location, everything.

Damn annoying. But removing it leaves you with only the web interface, which is clunky at best and fails when you try to do bulk up- or downloads so you have to do them in small quantities. And it creates ZIP files for downloads which is extra time-consuming and a complete waste when you are moving JPGs.

Is this not a Message Bar issue?
Options / Trust Center / Message Bar
Deselect [ ] Show Policy Tip in the Message Bar.
Worked for me. (We'll see for how long.)

The reason you get no response is the idiots at Microsoft have intentionally done this to entice you to give them all your personal information. Microsoft wants to control you. They won't remove it because they want your data (BIG BROTHER). How do you think they make money? They sell your personal information to advertisers. They won't fix the software because they need you to comply. I just keep hitting the "X". I won't succumb to their BS. As soon as another software company has software that can compete, I'm out of Microsoft entirely.

I wonder what would happen if we all tried to revert to Windows 7.

This is driving me crazy too. I wish I were still (just temporarily) a sysadmin who had a direct line to Microsoft support, but I'm retired now. At least I could make them listen back then.

The CMD and PS solutions (workarounds to reset the date of last nag in the registry) that have been supplied by others have been working well for me. Scheduling a task to run the command once a day is an easy fix.

Give it a try -- there are more fun things to do in retirement than hoping to get the attention of the MS developers.