This usually happens when Office is not recognizing the active subscription, or when the file itself is opening in a restricted mode.
Try these checks in order:
- Check whether Office is activated.
- If Word or Excel shows Unlicensed Product or an activation error, editing can be limited and files may open read-only.
- Check whether the file is marked read-only.
- In File Explorer, right-click the file, select Properties, and clear the Read-only attribute if it is selected.
- Check whether the file opened in Protected View.
- Files from email, the internet, or other potentially unsafe locations can open in Protected View, which allows viewing but limits editing.
- If the document is in Word, check Word’s open mode.
- In Word, go to File > Info > Protect document.
- If Always Open Read-Only is enabled, clear it.
- If the upper-right mode menu shows Viewing or Reviewing, switch it to Editing.
- If the file is stored in OneDrive, check storage.
- If OneDrive storage is full, the document cannot be saved until storage is available.
- If this affects Excel files that may be locked, close the file on all devices and wait a few minutes.
- A file can appear read-only if it is still locked by another session or by a previous session that did not close correctly.
- If none of the above fixes it:
- Restart the computer.
- Install Office updates.
- Perform an Online Repair of Office.