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It is necessary that you enable cookies on your system in order to use the single sign on option. To enable cookies safely:

Enable cookies on a Windows XP system
Open Internet Explorer and select Options in the Tools menu. Select the tab `Privacy`.

The cookie settings are in the top part of this tab. The slider sets the general policy.


Internet Options

Click 'Sites'. You can specify which websites have other settings than the general policy.

Internet Options - Privacy

Add the following sites. Fill in the URL's and click 'Allow'.
https://selfcare.kpnxchange.com -> SelfCare of the services
https://www.documentendelen-online.nl -> The logon page of Documentendelen Online
https://webmail.kpnxchange.com -> Webmail of Exchange Online
https://www.extra-hardeschijf-online.nl -> The URL of Extra Harde Schijf Online


Enable cookies on a Windows Vista system
Open Internet Explorer, select 'Page' and then 'Web Page Privacy Policy'.

Page- Web page privacy policy.

Click 'Settings'.

Privacy report.

The cookie settings are in the top part of this tab. The slider sets the general policy.

Internet Properties.

Click 'Sites'. You can specify which websites have other settings than the general policy.

Internet Options - Per site privacy actions.

Add the following sites. Fill in the URL's and click 'Allow'.
https://selfcare.kpnxchange.com -> SelfCare of the services
https://www.documentendelen-online.nl -> The logon page of Documentendelen Online
https://webmail.kpnxchange.com -> Webmail of Exchange Online
https://www.extra-hardeschijf-online.nl -> The URL of Extra Harde Schijf Online
Software Online