【Office365】Major Change Update @2019/2/1( Outlookアプリのセキュリティ強化 )

2019年2月7日

Office365 に関する Major Change Update 情報(2019/2/1付)をご案内いたします。Outlookアプリのセキュリティが強化されるようです。

具体的には、ToやCCといった宛先に外部アドレスが含まれていた場合、当該アドレスがハイライトされて表示されるようになるみたいです。宛先に外部アドレスが含まれていることが一目でわかるように可視化することで、誤送信の予防につなげる狙いがあるんでしょうか。

なお、本機能は、リリース時点においてはデフォルトでOFFとなっているようですが、2019年3月4日以降はデフォルトでONになるそうです。セキュリティレベル向上に寄与しかつ、ユーザビリティが著しく低下するようなUpdateでもないです。よって、システム管理者としては静観ですね。

 

※ Nortification の解釈に誤りがございましたら申し訳ございません。

≪Nortification≫

Microsoft will soon be rolling out a new Outlook for iOS and Android capability that helps protect sensitive company information by reducing the risk of inadvertently sending email to recipients outside your organization.

Outlook mobile will clearly alert you when an external recipient is in the email address list when composing or replying to email messages. This capability will be rolled out with the default setting OFF. On March 4th, Microsoft will change the default settings to ON so that all users will see a small tip, or notification, when there is a recipient in the To, Cc or Bcc lines that are outside their organization.

This enhancement is related to Microsoft 365 Roadmap ID 27555 and 27556.

These features will not be rolling out to GCC at this time.

[How does this impact me?]

When composing or replying to a message with external recipients using Outlook for iOS and Android, the external recipient email address is highlighted in the address list as well as in the body of the message if @mentioned. A small notice label is visible in the message header during the compose or reply process and is not visible by the external recipients once sent.

This feature can be controlled by IT administrators. Please see additional information for instructions on how to manage this app configuration setting using Microsoft Intune or any other MDM provider.

[What should I do to prepare for this change?]

There is nothing you need to do to prepare for this change; however, if you want to enable the people in your organization to see external recipient MailTip notifications in Outlook mobile prior to March 4th, you can deploy the setting to enrolled devices using your MDM provider at any time.

Information about setting general app configurations for Outlook for iOS and Android can be found by following the Additional Information

Sign in to the Office 365 Admin center to use the links below:

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