I am trying to install Exchange 2013 RTM on a new virtual server (Windows 2012). The server is a clean install with only the required requisites. The DC role is also installed (of course only for testing purposes). The install proceeds to step 6 of 15 (languages) and the fails with "Error: Index was outside the bounds of the array) Any idea how to proceed? Event viewer has the following entry: Log Name: Application Source: MSExchange Common Date: 03-11-2012 12:55:13 Event ID: 4999 Task Category: General Level: Error Keywords: Classic User: N/A Computer: exch2k13.testlab.local Description: Watson report about to be sent for process id: 3644, with parameters: E12, c-RTL-AMD64, 15.00.0516.032, ExSetupUI, M.Exchange.Management, M.E.M.D.MergePerfCounterIni.ReadTextSection, System.IndexOutOfRangeException, aae6, 15.00.0516.029. ErrorReportingEnabled: False Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="MSExchange Common" /> <EventID Qualifiers="16388">4999</EventID> <Level>2</Level> <Task>1</Task> <Keywords>0x80000000000000</Keywords> <TimeCreated SystemTime="2012-11-03T11:55:13.000000000Z" /> <EventRecordID>1401</EventRecordID> <Channel>Application</Channel> <Computer>exch2k13.testlab.local</Computer> <Security /> </System> <EventData> <Data>3644</Data> <Data>E12</Data> <Data>c-RTL-AMD64</Data> <Data>15.00.0516.032</Data> <Data>ExSetupUI</Data> <Data>M.Exchange.Management</Data> <Data>M.E.M.D.MergePerfCounterIni.ReadTextSection</Data> <Data>System.IndexOutOfRangeException</Data> <Data>aae6</Data> <Data>15.00.0516.029</Data> <Data>False</Data> <Data> </Data> </EventData> </Event>