Starting Outlook “There is a problem with the proxy server’s security certificate” in combination with Office365

Whole the day I worked fine with Outlook/Offic365, but a couple of hours ago I received the next error:

Outlook 2010 Office365 Certificate Error

Outlook 2010 Office365 Certificate Error

I searched a lot of time at the internet but I couldn’t find the right solution. A lot of websites pushed me to look at the ADFS certificates but that’s nog possible because when I logged in by browser and have no problem. When the certificate from ADFS was expired I also could not logon by browser. I solved my problem by deleting the Mail Profile and create a new one. But I like to know what’s the finally reason of the problem mentioned in the message (see picture).@-sign 25



Foutmelding bij openen Hotmail of Office365

Het Active-x besturingselement werkt alleen correct als het in Internet Explorer is ingeschakeld voor Outlook Web app. Klik hier om u af te melden, het ActiveX-besturingselement in te schakelen en u vervolgens weer aan te melden bij Outlook  Web app.

Wanneer je bovenstaande foutmelding krijgt na inloggen op Office365 dan moet je enkele instellingen wijzigen te weten:

It sounds like your Internet Explorer security settings are preventing you from running the ActiveX control.  Here is a workaround:

Warning this workaround may make a computer or a network more vulnerable to attack by malicious users or by malicious software such as viruses. We do not recommend this workaround but are providing this information so that you can implement this workaround at your own discretion. Use this workaround at your own risk.

To work around this issue, follow these steps:

1.  Close all currently active windows in Internet Explorer 7 or in a later version.
2.  Open Internet Explorer7 or a later version.
3.  On the Tools menu, click Internet Options .
4.  In the Internet Options dialog box, click the Security tab.
5.  Under Select a zone to view or change security settings , click Trusted Sites .
6.  Under Security level for this zone , click Custom level.
7.  In the Settings list, under ActiveX controls and plug-ins , make sure that you have the following settings configured as specified here:

• Under Binary and script behaviors , click Enable if it is not already selected.
• Under Download signed ActiveX controls , click Prompt if it is not already selected.
• Under Run ActiveX controls and plug-ins , click Enable if it is not already selected.
• Under Script ActiveX controls marked safe for scripting* , click Enable if it is not already selected.

8.  Under Miscellaneous , click Enable for the Launching applications and unsafe files setting if it is not already selected.
9.  Click OK , and then click OK  again to close the  Internet Options dialog box.