Fix Outlook Send/Receive Issue

My Outlook (Office 365 on Windows 10) has suddenly stopped sending or receiving mail. No error pop-ups appear, but messages sit in the Outbox and nothing new lands in the Inbox. I have already covered the basic ground—checked Offline Mode, restarted in safe mode, ran SCANPST, recreated the OST, and even rebuilt the profile—yet the problem remains.

I need a specialist who can jump on a quick remote session (AnyDesk or TeamViewer is fine) to track down the root cause and get send/receive working again without data loss. Whether it involves deeper profile repair, registry tweaks, firewall adjustments, or a clean Office reinstall, please diagnose, fix, and explain what you did so I can repeat the steps if this crops up later.

Deliverable:
• Outlook fully operational—test messages both sent and received successfully during the session, using my existing account setup.

If you’re fluent with M365, Exchange/IMAP configurations, OST/PST management, and advanced Outlook switches (/resetnavpane, /cleanprofiles), this should be straightforward. I’m ready to start as soon as you are.