If you want to send an encrypted email, until the Office 365 Encrypted Email feature is rolled out, the best options are either encrypted Office documents or 7-Zip encrypted archives. For instructions on how to use these see below:
Office File Encryption
An easy way to encrypt information that is already held in an Office document is to put a password on it, this automatically encrypts it too.
From within the file you wish to encrypt:
- Click on the Tools menu at the top of the screen
- Select the Protect Document... option
- Set a strong password to open the document - preferably using upper and lower case characters, numbers and symbols. You will need to re-enter the password.
- You can also set a password to modify the document if you wish.
- Click OK.
- Save the document.
7-Zip is good for encrypting containers, so if you have more than one file to encrypt it's particularly useful.
To create an encrypted archive
- From any Windows Explorer window (e.g. My Documents), right-click on the file or folder you want to encrypt.
- Select 7-Zip and then Add to archive.
- Select the Archive format .7z offers better compression (makes the files smaller) but .zip is usually a better choice because it offers better compatibility with other programs, such as WinZip.
- In the Encryption section, enter a strong password and select AES-256 as the encryption method.
To Extract files from an archive
- Right click on the archive, and click Extract files.
- In the window that appears, select where to extract the files to and enter the password for the archive.
- Click OK and the files will be unencrypted and extracted to the location you specified.
Office 365 Encrypted Email
This is a feature that will be coming soon.