Since I replaced with new computer, I am having a problem to download PST. My system is Windows 7 64bit, IE11 and .NET Framework 4.5.2 installed. I tried 2 different computers and browsers, but I still can't download. When I tried on old computer, I still could download, so that it is not permission issue. Here is the detailed message I am getting every time I tried to download. PLATFORM VERSION INFO Windows : 6.1.7601.65536 (Win32NT) Common Language Runtime : 4.0.30319.34209 System.Deployment.dll : 4.0.30319.34244 built by: FX452RTMGDR clr.dll : 4.0.30319.34209 built by: FX452RTMGDR dfdll.dll : 4.0.30319.34244 built by: FX452RTMGDR dfshim.dll : 4.0.41209.0 (Main.041209-0000) SOURCES Deployment url : r1.res.office365.com/.../microsoft.exchange.ediscovery.exporttool.application Server : Apache ERROR SUMMARY Below is a summary of the errors, details of these errors are listed later in the log. * Activation of r1.res.office365.com/.../microsoft.exchange.ediscovery.exporttool.application resulted in exception. Following failure messages were detected: + Your Web browser settings do not allow you to run signed applications. COMPONENT STORE TRANSACTION FAILURE SUMMARY No transaction error was detected. WARNINGS There were no warnings during this operation. OPERATION PROGRESS STATUS * [7/30/2015 4:14:53 PM] : Activation of r1.res.office365.com/.../microsoft.exchange.ediscovery.exporttool.application has started. ERROR DETAILS Following errors were detected during this operation. * [7/30/2015 4:14:53 PM] System.Deployment.Application.InvalidDeploymentException (Manifest) - Your Web browser settings do not allow you to run signed applications. - Source: System.Deployment - Stack trace: at System.Deployment.Application.ApplicationActivator.BrowserSettings.Validate(String manifestPath) at System.Deployment.Application.ApplicationActivator.PerformDeploymentActivation(Uri activationUri, Boolean isShortcut, String textualSubId, String deploymentProviderUrlFromExtension, BrowserSettings browserSettings, String& errorPageUrl) at System.Deployment.Application.ApplicationActivator.ActivateDeploymentWorker(Object state) COMPONENT STORE TRANSACTION DETAILS No transaction information is available. Thanks. Akiko