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We have a on primes &nbsp;Linux based mail server . we are plan to moving just a few people to Office 365 with same domain ,keeping the rest of users &nbsp;on &nbsp;existing Linux based email system ....is it possible and what are the challenges....??????
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We have a on primes  Linux based mail server . we are plan to moving just a few people to Office 365 with same domain ,keeping the rest of users  on  existing Linux based email system ....is it possible and what are the challenges....??????

How to Share an Email Domain Between Two Mail Systems -Office 365 exchange online and on primes Linux based  mail system

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.