E_PENDING (0X8000000A) – Data Not Yet Available

What's Actually Happening Here

The error code 0X8000000A is a COM (Component Object Model) return value that says: "I'm still waiting for the data, check back later." Windows throws this when a program asks for something – like a file from a USB stick or a setting from a service – and the response hasn't arrived yet. Instead of crashing, the app just sits there, frozen, with this cryptic message.

I've seen this most often with three scenarios: a slow USB flash drive during file copy, Microsoft Edge hanging on startup, or Outlook refusing to open a message. The cause is almost never a corrupt Windows file. It's usually the hardware being slow or a misbehaving add-in.

Cause 1: Slow or Failing USB Drive

This is the easiest to reproduce. Plug in an old USB 2.0 drive, try to copy a big file, and Windows returns E_PENDING if the drive takes too long to respond. The system is literally waiting for the drive to finish a command.

Fix: Force a Fresh Connection

1. Safely remove the USB drive – Use the icon in the taskbar, not just yanking it out. This tells Windows to flush any pending writes.
2. Unplug and wait 10 seconds. Then plug it into a different USB port – preferably USB 3.0 (blue port) if your PC has it.
3. Check the drive health – Open Command Prompt as admin and run:
   chkdsk E: /f (replace E: with your drive letter). If you see bad sectors, replace the drive. USB flash drives fail silently, and this error is often the first sign.
4. Shortcut to avoid it – For large file transfers, use robocopy instead of dragging and dropping. The retry logic in robocopy handles these delays better. Example:
   robocopy D:\source E:\destination /E /Z
   The /Z switch enables restartable mode, which doesn't give up on a slow device.

What's happening here is that Windows Explorer uses a simple read command that times out after a few seconds. Robocopy, being built for network transfers, is more patient. So it works around the root problem without fixing the slow drive itself.

Cause 2: Microsoft Edge Sync Stuck

On Windows 10 and 11, Edge has a sync feature that constantly talks to Microsoft's servers. If the server is slow or your internet is spotty, Edge can't get the data it needs and shows E_PENDING. I've seen this happen after waking a laptop from sleep – Edge tries to sync bookmarks but the network isn't ready yet.

Fix: Reset Edge Sync

1. Close all Edge windows.
2. Press Win + R, type edge://sync-internals/, and press Enter. This opens an internal debug page.
3. Look for the "Trigger GetUpdates" button and click it. This forces Edge to retry the sync immediately.
4. Still stuck? Open Edge settings (three dots > Settings > Profiles > Sync). Turn off the sync toggle and turn it back on after 30 seconds.
5. If that doesn't work, kill Edge's background processes: open Task Manager (Ctrl+Shift+Esc), find any Microsoft Edge processes, right-click and select "End task". Then restart Edge.

The reason step 3 works is that the sync internals page bypasses the frozen UI handler. Edge was waiting on a callback that never came. The "GetUpdates" trigger sends a fresh request directly, breaking the deadlock.

Cause 3: Outlook Add-in or Sync Issue

Outlook 2019 and Microsoft 365 users hit this when trying to open a calendar item or email that references online data – like a SharePoint link or an online meeting. The app can't finish loading because the data source is unreachable.

Fix: Disable Problematic Add-ins

1. Open Outlook in safe mode: hold Ctrl while clicking Outlook's icon, or run outlook.exe /safe from the Run dialog (Win+R). If the error disappears, an add-in is guilty.
2. Go to File > Options > Add-ins. At the bottom, next to "Manage", select "COM Add-ins" and click "Go".
3. Uncheck all add-ins, restart Outlook normally. Re-enable them one by one until the error comes back. That's your culprit – often a calendar add-in like Zoom or Teams.
4. Alternative cause: caching – Outlook uses an offline cache (.OST file). If it's corrupted, the app can't fetch data from Exchange. Run this in CMD as admin:
   Outlook.exe /resetnavpane
   This resets the navigation pane without deleting your data.

The real fix for the add-in case is removing the troublemaker. The E_PENDING error happens because the add-in intercepts the data request and doesn't return control to Outlook in time. Safe mode skips all add-ins, confirming this.

Quick-Reference Summary Table

One last thing: you won't fix E_PENDING by running SFC or DISM. I've tried. The error isn't corruption – it's a timing problem. If none of these fit, check the app's log files (Event Viewer, Application logs) for the exact module that timed out. That's your next clue.