RE: Migrating to Exchange Online Plan 1 (Office 365 E1) from MessageLabs/Symantec.cloud

Hi Brizzle,

Since we are not familiar with MessageLabs/Symantec.cloud, we may not fully understand the terms you listed here. But what I can tell you is that you will get Exchange Online protection if you choose Office 365 E1 Plan.
Reference: https://technet.microsoft.com/en-us/library/jj723137(v=exchg.150).aspx
https://technet.microsoft.com/en-us/library/exchange-online-service-description.aspx

If there is any misunderstanding, or anything is not clear, please feel free to post back. We’re always here to assist you.

Thanks,
Richard