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Note: You might need to click the Show hidden icons arrow next to the notification area to see the OneDrive icon. If the icon doesn't appear in the notification area, OneDrive might not be running. Select Start, type OneDrive in the search box, and then select OneDrive in the search results
If the document library does not enforce check out before editing, you can edit a file without checking it out. If you want exclusive editing, or the document library requires check out first, you can check the file out before opening and editing. For more info on checking files in or out, see Check out or check in files in a document library