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Microsoft launched Outlook for Android and iOS phones and tablets at end of January. The new version offers support for IMAP mailboxes and management for contacts and calender.

In contrast to other mail clients for smartphones like K9-Mail the MS Outlook app doesn’t connect our mail servers directly in case of usage with a mailbox.org account. It will send your login credentials to Microsoft cloud servers without your explicit permission. The MS cloud service will fetch all your e-mails form your mailbox.org account as contacts and calenders too and will provide it to your Outlook app. Attachments are stored in a MS cloud drive.

Privacy Policy Outlook for iOS & Android (part):

Email Credentials. We collect and process your email address and credentials to provide you the Service.

Email Data. We collect and process your email messages and associated content to provide you the Service. … Your email data may contain messages, address book, contact information, message attachments and calendar information.

Because of this privacy issues the Swiss Federal Institute of Technology Lausanne, F-Secure, the Universities Delft and Wisconsin, the EU parliament and others prohibit the usage of MS Outlook app for Android and iOS phones and block the access to MS related cloud services. The EU Parliament’s IT department (DG ITEC) has warned all members of EU parliament by mail:

Please do not install this application, and in case you have already done so for your EP corporate mail, please uninstall it immediately and change your password….

The apps will send password information to Microsoft without permission and will store emails in a third-party cloud service over which the Parliament has no control.