Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

Outlook users sometimes see errors like "Cannot start Microsoft Outlook" or "The file C:\Users\.....

When Outlook behaves strangely — messages not sending, calendar not syncing, or random crashes — ...

If you see a '504 Gateway Timeout' error when opening Windows Security or running a scan, Windows...

If you see a 502 Bad Gateway error after rebooting your server or workstation, i...

When you try to install or repair Windows Search using an offline installer, you might see an err...

You try to run Windows Update and get an error like 0x8024401c or a message that the update servi...