Microsoft
Microsoft
MicrosoftThis blog post is talking about the AIP add-on client, not licence. The Purview name is just an umbrella brand for all of the Microsoft Compliance features. Although it has many products and services underneath them you don't need to buy or use them all. A lot of what you need is included in the M365 subscriptions. The general rule is, if it will use an Office feature then the relevant Purview service will be included in one of the subscriptions (e.g. E3, E5 etc). If you are using OME currently then my understanding is it will just automatically become PME
What subscriptions do I need to use Microsoft Purview Message Encryption?
To use Microsoft Purview Message Encryption, you need one of the following plans:
Microsoft Purview Message Encryption is offered as part of Office 365 Enterprise E3 and E5, Microsoft 365 Enterprise E3 and E5, Microsoft 365 Business Premium, Office 365 A1, A3, and A5, and Office 365 Government G3 and G5. You don't need additional licenses to receive the new protection capabilities powered by Azure Information Protection.
You can also add Azure Information Protection Plan 1 to the following plans to receive Microsoft Purview Message Encryption: Exchange Online Plan 1, Exchange Online Plan 2, Office 365 F3, Microsoft 365 Business Basic, Microsoft 365 Business Standard, or Office 365 Enterprise E1.
Each user benefiting from Microsoft Purview Message Encryption needs a license to use message encryption.
For the full list, see the Exchange Online service descriptions for Microsoft Purview Message Encryption.
As mentioned in the EXO Service description link, you must add Azure Information Protection Plan 1 to the following plans: Exchange Online Plan 1 or 2, Office 365 F3, Microsoft 365 Business Basic or Standard, or Office 365 Enterprise E1 To receive Microsoft Purview Message Encryption. @Bob, it seems the article you linked to is talking about is Azure related. Although the rights management is connected between Azure and M365 you won's see the old AIP name in the Azure Portal
To use the feature you don't need to install anything as it is built into the Outlook desktop apps and the web version.
The FAQ is a great source of info, including what the differences are between OME, IRM and the Purview Solution Message encryption FAQ | Microsoft Learn
FYI, if included in your licence, you can also use the sensitivity labelling encryption features in Purview Information Protection. That has the added benefit of working on files as well as emails. More info on this is here: Apply encryption using sensitivity labels | Microsoft Learn
I hope that helps. That's about the limit of my knowledge. For purchasing add-ons open a billing related support ticket with Microsoft or contact your licensing reseller