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Strange IE Mailto link error - Sys.InvalidOperationException



I am getting a strange error in IE. There is an A tag with a mailto link. It works fine for one email ID but fails for multiple email IDs.
End user uses IE 9 with Win 7 SP1
Tested in IE 11 with Win 7 SP1 too.

This happens only in their environment. The site is an Office 365 SharePoint site. Can see that the link instead of just opening the email client does a post back and has this error message :

Sys.InvalidOperationException: Cannot access https://outlook.office365.com/owa/SuiteServiceProxy.aspx?exsvurl=1&realm=office365.com&

Has anyone come across this error?

Profiler log goes like this :

Function
which
Sys.UI.DomEvent
Sys.WebForms.PageRequestManager.prototype._createPostBackSettings
Array.contains
Date
removeEventListener
Sys.WebForms.PageRequestManager.prototype._matchesParentIDInList
defaultView
Sys.WebForms.PageRequestManager.prototype._onFormElementActive
removeListener
Array.indexOf
Sys.WebForms.PageRequestManager.prototype._onFormElementClick
type
isNaN
SP.Ribbon.WebPartComponent.prototype.$4x_1
altKey
SP.UI.AspMenu.prototype.showSubMenu
button
SP.UI.AspMenu.prototype.hideSubMenu
clientX
Sys._indexOf
clientY
ctrlKey
Date.getTime
target
Anonymous function
offsetX
offsetY
screenX
b
screenY
shiftKey
disabled
name
String.prototype.startsWith
id
parentNode
UpdateCorrelationIdForAppCacheIfNeeded
nodeType
SP.BWsaClient.prototype.uploadWsaData
WSAEnabled
namespaceURI
e
WSACEIPEnabled
window
Sys.UI.DomElement.containsCssClass
msWriteProfilerMark
DiscardIMNControl
document
body
SendWSA
tagName
className
SP.BWsaClient.prototype.$v_0
Array.isArray
m$.makeArray
Array.push
SP.Ticks.getTicks64
m$.isUndefinedOrNull
Array.shift
String.split
Array.slice
String.substr
CUI.PMetrics.perfMark
IMNHideOOUI
SP.Ribbon.WebPartComponent.$5r
String.toLowerCase
String.toString
Boolean
Array.forEach
SP.UI.UIUtility.isTextNode
SP.UI.UIUtility.isSvgNode
Function.apply
Anonymous function
Anonymous function
Sys.WebForms.PageRequestManager.prototype._getPostBackSettings
Anonymous function
Function.call
SP.UI.UIUtility.focusValidOnThisNode
SP.BWsaClient.prototype.get_isContinuation

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