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Exchange Hosted Encryption (EHE) Upgrade Center


Applies to: Exchange Online Protection

Topic Last Modified: 2014-10-20

Office 365 Message Encryption is the new version of Exchange Hosted Encryption (EHE). All EHE customers have been upgraded to Office 365 Message Encryption.

Like EHE, Office 365 Message Encryption lets email users send encrypted email messages to anyone. The table below compares EHE with Office 365 Message Encryption. To learn more about Office 365 Message Encryption, see Encryption in Office 365.


Feature description Exchange Hosted Encryption (EHE) Office 365 Message Encryption

Send encrypted mail to anyone



Custom branding


Yes. See Add branding to encrypted messages.

Language localization


Yes. See Service information for Office 365 Message Encryption.

Message size limit

10 MB

25 MB

Integration with Exchange transport rules

Yes (requires complex headers)

Yes (simplified with single-action encryption and decryption rules)

Integration with Microsoft’s Data Loss Prevention (DLP) service



User experience

Legacy portal (for external recipients)

Rich, modern Office 365 user interface

Purchase Option

Sold standalone

Included with Microsoft Azure Rights Management subscription and Office 365 Enterprise E3 and Office 365 Enterprise E4.

Authentication method for recipients outside your organization to access encrypted messages

EHE Authentication

Microsoft account or the work account you use with Office 365.

To learn more about what the upgrade means for you and your email users, see the following topics.

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