Our company is currently looking to upgrade our Office365 licenses from the basic Mail to the E2 tier for the sharepoint capabilities.
Context: https://www.microsoft.com/en-us/office365/all-plans.aspx
We are aware that upgrading from the P1 tier to one of the E tiers is not possible, but I have not come across any examples of moving from the basic mail plan to an E tier.
Is this possible?
Can we expect any problems, such as loss of mailbox contents/calendars?