This webpage wants to run the following add-on: ‘MSXML 3.0 SP10’ from ‘Microsoft Corporation’ When signing into ‘Outlook Mail’ a pop-up at the bottom of the page states, This webpage wants to run the following add-on: ‘MSXML 3.0 SP10’ from ‘Microsoft Corporation’ with a blue link question stating ‘What’s the risk?’. Before the XSD Recommendation, MSXML also implemented XML-Data Reduced (XDR), an XML schema language from Microsoft. XDR is supported in MSXML 3.0, MSXML 4.0, and MSXML 5.0, but it was not made available in MSXML 6.0. System administrators using Microsoft XML Core Services 2.6 and later should download this patch. Microsoft XML 3.0 Core Services Vulnerability Patch.
MSXML can be used when working within applications that support Visual Basic for Applications (VBA), such as Microsoft Office 2003, Microsoft Office 2007 or Microsoft Office 2010.
For example, to set a reference to MSXML in a VBA project within Microsoft Word, do the following:
MSXML Documentation
Open Visual Basic Editor in Microsoft Word by editing a Macro.
In the list of available references, select from any of the following versions of MSXML you have installed and wish to reference in your VBA project:
Microsoft XML, v 3.0.
Microsoft XML, v 4.0 (if you have installed MSXML 4.0 separately).
Microsoft XML, v 5.0 (if you have installed Office 2003 - 2007 which provides MSXML 5.0 for Microsoft Office Applications).
Microsoft XML, v 6.0 (on Windows Server 2003 you have to install MSXML 6.0 separately.
Click OK.
MSXML - Wikipedia
Once this reference is made, you can call and use MSXML application programming interfaces directly from within your VBA project code modules.