If your version is not at least 6.20188, contact your departmental IT staff for assistance in upgrading, or download the latest version from. You can often find the Outlook product version by selecting Help > About. If you are using Windows 10 and your Outlook doesn't match the images above, you're likely using an older, unsupported version of Outlook, such as Outlook 2003. For example, yours may list Microsoft 365 Apps for enterprise, and you can see which apps it contains by their icons. You'll find your version and build number under Product Information.

You'll see the product version on the right side of the page. If you don't see the Office Account option, select Help. To check which version you're running you can: IMPORTANT : In order to make use of the features in this article, your Outlook client must be at least version 6.20188, which is the December 2018 build of the O365 Office client. Why Don't I See the Encrypt Button in the Compose Window on Office for Mac?.Do messages remain Encrypted after a recipient forwards the encrypted message?.Do encrypted messages always have to be viewed via the O365 secure portal?.

How can a recipient of an Encrypted message reply after viewing the encrypted message?.

How can an external recipient open the encrypted message?.

What encryption types are available to me and what do they mean?.

This article describes how to encrypt email in Office 365. O365 delivers multiple encryption options to help us meet our needs for email security.

Why is the encrypt option greyed out