There are a couple common scenarios that occur that can cause an invalid product key error with Office 2010 volume license edition when attempting to install the VL MAK key. 

1. After purchasing a Volume License edition of Office 2010, when entering the key that came with the discs that were sent in the mail, you get invalid product key.

2. After installing the Volume License edition of Office 2010 and entering the MAK product key that you obtained from the Volume License Service Center you get invalid product key error

First it is important to understand that 32 bit versions of Office 2010 that are volume license will not ask you for a product key during the installation. Both of the scenarios above assume that you have already installed Office 2010 VL, and are now trying to enter the product key post installation by clicking on “change key”.

Issue #1

When you purchase Office 2010 from a Volume License retailer and you opt for physical media to be sent to you, you will find that it comes with 3 discs and a product key.

After you install Office 2010 successfully and try to input the product key that comes with the media you will get an invalid key error. The reason for this is because the product key that ships with the media is for “Office Web Apps” and not in fact for Office 2010 ProPlus.

To obtain the VL MAK key for Office 2010 you will need to logon to the Volume License Service Center. After you purchased your Volume License version of Office 2010, you should have received an email from the Volume Licensing Service Center (msvlop@microsoft.com) welcoming you to register at the VLSC. You will need to find this email, and login to the VLSC and obtain your VL MAK key from there. If you didn’t receive this email and you expect that you should have, or need assistance logging on to the VLSC you can call the following number for VLSC support (866-230-0560 Option 3) They should be able to pull up your VL agreement using the email address or company name of the purchaser.

Issue #2

After installing the Volume License edition of Office 2010 and entering the MAK product key that you obtained from the Volume License Service Center you get invalid product key error.

It is not uncommon for folks to install the volume license version of Office 2010 on a machine without first uninstalling the preinstalled OEM version of Office 2010 from the machine. Then when running Microsoft Office 2010 from the start menu they are actually launching the OEM version of Office 2010 rather than the VL Standard/Proplus version. The Office 2010 OEM version has an icon that looks like this:

 OEM


If you are clicking on this icon, it is expected that your VL MAK key would give you an invalid key error message, because the OEM version is being run and that version will not accept a VL key.

Solution-
Check programs and features in the control panel, and ensure that you only have one entry for the Office 2010 suite. Uninstall the OEM version of the Office 2010 suite. 

Here is an example of what Programs and Features will look like when the OEM version is installed along side the Office 2010 ProPlus VL version.

uninstall

The entry above that says “Microsoft Office 2010” is the OEM version of Office 2010 and will not accept a VL product key. Since you installed the Volume License version of Office 2010 Standard/ProPlus feel free to uninstall the version that is labeled “Microsoft Office 2010”.

After you uninstall the OEM version of Office 2010 now you can click on start, programs, Microsoft Office, and click on an Office application. (IE Word, Excel). Then you can input the MAK key by going to file, and help inside the application and choosing Change Product Key.

key