A Microsoft file hosting and synchronization service.
“You recently opened this” in the OneDrive web Activity column means the file was opened or previewed by you (the signed-in user) but OneDrive did not detect a saved modification. It is based on a file access event recorded by Microsoft 365 when the file is opened through OneDrive, SharePoint, or an associated web app (such as Word/Excel/PowerPoint Online) or previewed in the browser. It typically indicates a read/open action without a committed save.
If the user actually edits the file and the change is saved, the Activity column normally shows a message such as “You edited this” (or similar wording like “Modified by you”). In that case the event recorded is a modification event tied to the file’s Last Modified metadata and version history. If the file is opened but closed without saving changes, it remains an “opened” activity rather than an edit.
The “recently” label is not tied to a documented fixed duration. It is a relative UI label that appears when the open event is within the recent activity window that the OneDrive web interface surfaces (generally on the order of hours to a few days). After the event falls outside that window, the Activity column typically stops showing the open message and instead just shows the standard modified information (for example “Modified X days ago by …”) or becomes blank if nothing else happened.
For normal users in OneDrive on the web, there is usually no persistent “last accessed” timestamp available in the file details once the recent activity indicator disappears. File metadata exposed in the UI mainly tracks last modified time and version history, not read/open timestamps. Detailed access history can exist in Microsoft 365 audit logs for administrators, but that information is not normally visible to standard users in OneDrive’s file details panel.
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hth
Marcin