Does someone else have access to my iCloud?

They'll need your Apple ID and password to use it.

Did you gave it to them?

You can change your password and setup 2 factor authentication.

Read here => Sign in and manage your Apple Account on iPhone – Apple Support (AU)

Vevette17 (author)

Perhaps you should change your Apple Accounts

password as that also affects user's iCloud acc't.

https://duckduckgo.com/?t=ftsa&q=update+iCloud+password+&ia=web

.These are basic to most things an owner user can do for their own best interests.

No, I did not give any information. I inadvertently saved everything from my Desktop (MacBook Air) to iCloud - which I did not mean to do - and I can no longer have access my files. If I turn it off in iCloud, it says I will lose everything. Can you please tell me if/how I can safely put everything back to my Desktop? I no longer have access to my email [email protected] in my Mail folder (which I preferred) nor any other documents. I have tried everything and read as much as I could by myself without success. I desperately need help!

"How do I know if I inadvertently gave access to my iCloud account to Microsoft?: [...]Can you please tell me if/how I can safely put everything back to my Desktop? I no longer have access to my email [email protected] in my Mail folder (which I preferred) nor any other documents. I have tried everything and read as much as I could by myself without success. I desperately need help!"

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Get your Apple Account Changed:

Assuming you are referring to your Apple Account (the email address you use to log into Apple with), if you no longer have access to this eMail Account, then you need to change it on your Apple Account to a new eMail Address. Go here:

Contact Apple Support:

Ask the Apple Rep to modify it over the phone. If permitted to do so, then inform to modify the Phone Numberand other credentials associated to your Apple Account, to what it should be. Important: Perform a Trial & Error login session with the Apple Rep prior to ending the phone call.

Contact ApleSupport. 

• Contact Us - Choose Locations
• Proceed from there as Necessary

Screensharing with Apple Rep:

To easily troubleshoot this, screenshare you iPhone while the Camera app is open and with speakerphone on. Doing so, the Apple Rep will see this firsthand, fro YOUR perspective.

Learn More at My User Tip:  Screenshare your iPhone with the Camera App Enabled to EasilyConverse Over-the-Phone with Apple Support - User Tip

"How do I know if I inadvertently gave access to my iCloud account to Microsoft?: [...]Can you please tell me if/how I can safely put everything back to my Desktop? I no longer have access to my email [email protected] in my Mail folder (which I preferred) nor any other documents. I have tried everything and read as much as I could by myself without success. I desperately need help!"

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Getting All of iCloud Drive Data:

Download All of iCloud:

One thought would be to download all of iCloud, and then search through it in Finder on a Mac. You would download it to an external drive, and then open the drive in Finder. Search through it using the search bar on the top-right corner of the Finder window. Once found, you can trash what's iCloud using Finder. Use my user tip: Getting a Quick and Direct "iCloud Drive-to-External Hard Drive" Download - User Tip

I wish to thank everyone who answered my request. I finally went to Apple local store and had everything checked out. All is back to normal. :-)

See my message above