Exchange Online Impersonation (New-ManagementRoleAssignment)

Hi all,

I know there is a similar post on this but that seems very old. Therefore,, I have started a new post.

1. Have an O365 Trial  subscription
2. Need to create a sandboxed webpart for my trial SharePoint online site
3. The webpart should be able to let users send emails including creating meeting invites.
4. I used EWS 2.0 Managed API and am able to send an email/ meeting invite from a console app.

Question 1

Will the code in the console app work from within my webpart? I mean, is there anything that will prevent it from working or is one of those "not supported scnearios" ?

Question 2

Need to assign one of the users on my trial  online domain as the service account with impersonation permissions to send emails and meeting invites on behalf of the O365 user logged into my SP online site  and using my webpart. How do I do this today on my trial account? Is New-ManagementRoleAssignment supported yet? 

Thanks,

Karthik