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IIS 7.0 event log: Viewstate verification failed. Reason: The viewstate supplied failed integrity

All User-Agents seem to be Internet Explorer 7.0 as shown below:  "User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; InfoPath.2)"
 
We are running ASP.NET 2.0 with Microsoft .NET Framework 4 for Windows Server 2008 R2 x64-based.
 
We are not running on a Web Garden. We have dedicated hardware, with one VM for our IIS server and one for our SQL server.

Question: We have not seen this with MSIE 8.0.  Is there a fix, or is do we need to tell our users to update their browser?
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