Encrypt only rolling out starting today in Office 365 Message Encryption

Hi

Would anyone like to comment on or confirm the following please:

1. Despite trawling through a truck-tonne of documentation there is no explicit indication that OME is not integrated into Outlook on any version of office OTHER THAN ProPlus editions? We have ended up somewhat embarrassed having recommended and upgraded a customer from O365 Business Essentials to O365 Business Premium and adding Azure Information Protection P1 - which works nicely in OWA, but the desktop Office in O365 Business does not include RMS and therefore OME capabilities - so we've now had to move them to E3 to get ProPlus which is nearly 2x monthly cost.

The only documentation I found on this is mentioned in passing in a doc for Azure IRM, which was on display in the bottom of a locked filing cabinet stuck in a disused lavatory with a sign on the door saying ‘Beware of the Leopard' - http://download.microsoft.com/download/E/C/F/ECF42E71-4EC0-48FF-AA00-577AC14D5B5C/Azure_Information_Protection_licensing_datasheet_EN-US.pdf. It says:

"Azure Information Protection is not included but can be purchased as a separate add-on and will enable the supported Information Rights
Management (IRM) features. Some Azure Information Protection features require a subscription to Office 365 Pro Plus, which is not included
with Office 365 Business Essentials, Office 365 Business Premium, Office 365 Enterprise E1, Office 365 Education, or Office 365 Enterprise F1."

without going into any detail about which features require ProPlus.

2. The only way to send encrypted emails from a mobile device is to use OWA? Although the Outlook App can display encrypted messages you've been sent (and presumably your response is encrypted also), you can't compose a message and choose to have it encrypted - unless maybe you've got a server-side rule that would cover it for you.

Thanks

EDIT:
Just found 1 mention about issue 1 here - so it is known but not well documented/publicised:

https://techcommunity.microsoft.com/t5/Security-Privacy-and-Compliance/Email-Encryption-and-Rights-Protection/ba-p/110801

In comment from Caroline Shin  at 10-30-2017 05:41 PM