Outlook + OneDrive = Silent Syncing? A Serious Privacy Concern

🚨 
Hey folks, I stumbled upon something that left me stunned — and frankly, furious.
I was using classic Outlook (not the new web-based version) on my Windows machine. After what I assume was a silent update, email accounts I had previously configured on my Mac (also using Outlook) mysteriously appeared on my Windows device. I had deleted all profiles and started fresh, yet my IMAP and Pop accounts reappeared.
Yes, you read that right: accounts from my Mac showed up on my Windows PC without my input.
Digging deeper, I realized OneDrive had been quietly syncing my mail data — including  accounts linked to cPanel. OneDrive was active but wouldn’t launch properly. Turns out, it was busy harvesting my account configurations behind the scenes.
The moment I uninstalled OneDrive, the syncing stopped. Outlook no longer recognized any of my accounts. That’s when it hit me: my data had been synced somewhere, without my consent.
🔍 Here’s where I looked:
•     Outlook Data Files (.pst/.ost) — empty
•     Credential Manager — nothing
•     Registry — traces of profiles, no accounts
•     Microsoft Account Sync Settings — disabled
I also found a new folder under Account Settings > Data Files linked to OneDrive. The path couldn’t be deleted or changed.
Conclusion:
Classic Outlook appears to sync  account data via OneDrive or another Microsoft service — without asking the user. That’s not just sneaky. It’s a serious security and privacy issue.
💣 Message to Microsoft:
If you're charging for software, don’t sneak behind users’ backs. If you're going to sync data, ask first. I paid for Outlook — and got surveillance.
I’m still shocked this is even possible.
If anyone else has experienced something similar, speak up. This needs visibility.