Files Won't Sync in OneDrive

- Look for a red X or yellow warning on the OneDrive tray icon — hover over it to read the actual error code. - Pause syncing, wait 30 seconds, then resume it. - If a specific file is blocked, it might have a restricted character in the name (like # or %) — rename it and retry. - Signing out of OneDrive and back in often clears stuck sync states without losing data.

Excel or Word File Won't Open

- If the file is on SharePoint or OneDrive, try opening it directly in the browser instead of the desktop app. - A corrupted local cache can block file loading — clear it by going to %localappdata%\Microsoft\Office\16.0\OfficeFileCache and deleting the contents. - If you get a 'format not supported' error, check that the file extension matches the actual format.

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Service info and troubleshooting

Can't Sign Into Your Account: The most common culprit is a cached session that went stale. Clear your browser cookies, open a private window, and try logging in at login.microsoftonline.com again. If you use the desktop app, go to File → Account → Sign Out, then sign back in. Also check that your system clock is accurate — a time mismatch of more than a few minutes breaks authentication silently.
Outlook Stops Sending or Receiving Mail: First, check the outbox for stuck messages and delete any that are frozen there. Then go to Send/Receive → Work Offline and toggle it off if it's active. If the issue persists on the web version too, the problem is likely on the account level — try removing and re-adding the account in the desktop client.
Files Won't Sync in OneDrive: Look for a red X or yellow warning on the OneDrive tray icon — hover over it to read the actual error code.

Pause syncing, wait 30 seconds, then resume it.

If a specific file is blocked, it might have a restricted character in the name (like # or %) — rename it and retry.

Signing out of OneDrive and back in often clears stuck sync states without losing data.
Teams Messages Not Sending: This usually happens when the app loses its connection mid-session. Click your profile picture, choose Sign Out, relaunch Teams, and sign back in. If messages show as sent but recipients don't see them, the issue is likely a brief server-side delay — give it a few minutes before escalating.
Interface Freezes or Loads Slowly: Heavy browser extensions are often behind sluggish Microsoft 365 performance in the browser. Try disabling them one by one, or switch to a clean browser profile. For desktop apps, go to File → Options → Add-ins and disable COM add-ins that you don't actively use — they load at startup and quietly eat resources.
Excel or Word File Won't Open: If the file is on SharePoint or OneDrive, try opening it directly in the browser instead of the desktop app.

A corrupted local cache can block file loading — clear it by going to %localappdata%\Microsoft\Office\16.0\OfficeFileCache and deleting the contents.

If you get a 'format not supported' error, check that the file extension matches the actual format.