Sure you can turn off the Office ClipBoard (a feature to remember the last 21-24 "copied items").

Here is what Office help says:
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Turn off the Office Clipboard
1. On the Office Clipboard task pane, click Options.
2. Clear the Show Office Clipboard Automatically check box.
3. Clear the Show Office Clipboard When Ctrl+C Pressed Twice check box.
Note: To copy items to the Clipboard while it is turned off, select the Collect Without Showing Office Clipboard check box.
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