Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
You have to be really careful with purchases online. There was a question recently where a guy bought a Pro retail box that turned out to be counterfit. But it took a lot of effort to confirm that it was counterfit. He is now in the process of returning it.
Sometimes they sell you licenses to versions that are not supposed to be resold. So it might work today, but 6 months or a year down the line when MS finally figures out that the license was improperly sold and deactivates your installation. You are out of luck.
If the price is too good to be true, it IS too good to be true. Especially for 2010. You can realistically expect to see larger discounts for older versions because they can be legitimate "Old Stock".
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Link to: Silverlight Applets Mapping 2003 Menu to 2010 Ribbon for all Office Apps
Link to: Search for 2007 Commands addin
Link to: Flash Applets Mapping 2003 Menu to 2007 Ribbon for all Office Apps