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Important notice for users of Office 2003: To continue receiving security updates for Office, make sure that you're running Office 2003 Service Pack 3 (SP3). The support for Office 2003 ends April 8, 2014.
If you’re running Office 2003 after support ends, to ensure that you will receive all important security updates for Office you need to upgrade to a later version such as Office 365 or Office 2013. For more
information, see Support is ending for Office 2003. Invalid product key errors in Microsoft OfficeArticle ID: 836178 - View products that this article applies to. On This PageAre you receiving an invalid product key error in Microsoft Office 2010?If you see this error message after entering your product key, start the Online Solution Wizard.This is not a valid Office Product key. See above examples to learn more. Run the Online Solution Wizard
(http://support.microsoft.com/common/survey.aspx?scid=sw;en;1844&showpage=1)
for a step-by-step solution is available to resolve this problem.Are you receiving an invalid product key error in an earlier version of Microsoft Office?If you are looking for information on validation errors in an earlier version of Microsoft Office, click to view the following article in the Microsoft Knowledge Base:2549291 Invalid product key errors in Microsoft Office 2007 or 2003
(http://support.microsoft.com/kb/2549291)
ReferencesDo you have problems finding your Office 2010 product key? Learn more about how to find your Office 2010 product key.
(http://support.microsoft.com/common/survey.aspx?scid=sw;en;1844&showpage=1)
Did you lose your Office product key? Are you looking for information about how to replace it? Learn more about how to replace a lost or damaged Microsoft Office 2010 product key.
(http://support.microsoft.com/common/survey.aspx?scid=sw;en;1844&showpage=1)
Do you have questions about the Office 2010 product key card? Read frequently asked questions about product key cards.
(http://office.microsoft.com/en-us/buy/office-product-key-card-frequently-asked-questions-HA101847520.aspx)
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