Copilot not working in Outlook [Fix]

If Copilot is not working in Outlook on your Windows 11/10 PC, verify your Microsoft 365 subscription includes Copilot, ...
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I built my own sync system without Google Drive or OneDrive and it works flawlessly

I recently replaced Google Drive with a self‑hosted NextCloud server, but there are several other options to explore. So, I tried Syncthing.