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Hi, need a litle push in how to do this. 
 
Old system: 
Windows 2011 (Exchange 2010) 
50 users (all in one OU) 
 
New system: 
Windows 2012 R2 
50 users (Splitted in some new OU's) 
Office 365 E3 
Azure AD connector 
 
What is the best way to do this? 
 
1. 
Migrate the old exchange to cloud with the migration tool in Office 365, this makes all the users too? 
Use Azure AD to define OU's in the cloud? 
Install Azure AD connector on new server, sync all OU's and users from cloud to new server. 
In this way users dont have any downtime on there mail. 
 
2. 
Setup new server, OU's and users, sync that to the Office 365 
Use migration tools like codetwo to migrate old mailbox from old exchange server to Office 365 
This would make a downtime when the mail migrate? 
 
3. ??
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Hi, need a litle push in how to do this.

Old system:
Windows 2011 (Exchange 2010)
50 users (all in one OU)

New system:
Windows 2012 R2
50 users (Splitted in some new OU's)
Office 365 E3
Azure AD connector

What is the best way to do this? 

1.
Migrate the old exchange to cloud with the migration tool in Office 365, this makes all the users too?
Use Azure AD to define OU's in the cloud?
Install Azure AD connector on new server, sync all OU's and users from cloud to new server.
In this way users dont have any downtime on there mail.

2.
Setup new server, OU's and users, sync that to the Office 365
Use migration tools like codetwo to migrate old mailbox from old exchange server to Office 365
This would make a downtime when the mail migrate?

3. ??

Office 365 migration

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.

Microsoft 365

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.