Partial move of key users to Office 365 and caveats to be aware of.

I have a client that is in need of a better email service and am almost ready to move them to Office365.

While preparing I've noticed that only certain key users will see benefit of the more robust mail system.

Many of the users have very basic email needs.

One of the biggest driving forces behind the move is for the key players to have synchronized email/contacts/calendars on all devices. The basic users only pop from a single computer.

If all users were moved there would be 20 accounts with the possibility of more, mostly basic users, as time goes on.
there are only 7 key players. which is $1200 year comparted to $420 a year.

My thoughts were to create a new domain for the key players and open an account with that domain and create their users.
I would then forward all email from their old email address to the new email address.
Nothing changes with the other 15 users

The only caveat I can think of with the key players is that since they would then be sending email as the new email account, someone searching or sorting email may not see them all grouped together, which is a very minimal problem in my opinion.

Of course what would also be missing is the ability to share calendars/contacts with the users that stay on the old server, popping. They would also not be part of the GAL, nor would they be able to see it.

I know there are other aspects of Office 365 business essentials that they wouldn't have such as Sharepoint and video conferencing, etc. but I think those are things that wouldn't be utilized anyway.

Any input is appreciated and thanks in advance.
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Vasil Michev (MVP)Commented:
There's more to Exchange than just email though, and even more value if we consider all the other collaboration features in Office 365. The fact that they havent used conferencing or document collaboration previously doesnt mean they will not like those features. In fact, this is the best thing about O365 for smaller companies - they can enjoy enterprise grade features for just a fraction of the price.

If they dont see the value in those features or the price is prohibiting, go with the above scenario. Dont forget that there are Kiosk licenses as well, they might be suitable for the non-key users.

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