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This is possible although it will not going to work as your client expect. You can create multiple profiles per user in Outlook. When the office e-mail goes down the user will switch to the other profile and will use Office 365. However the e-mails from the office profile will be not available in the Office 360 profile. Why they don't want to switch to Office 365 ?
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This is possible although it will not going to work as your client expect. You can create multiple profiles per user in Outlook. When the office e-mail goes down the user will switch to the other profile and will use Office 365. However the e-mails from the office profile will be not available in the Office 360 profile. Why they don't want to switch to Office 365 ?

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Dear All,<br />
<br />
I have a customer which he looking to implement office 365 (Exchange online) only as a backup, so whenever his on-premise goes down, clients will connect to office 365 and keep using emails, is that possible?<br />
<br />
Thanks
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Dear All,

I have a customer which he looking to implement office 365 (Exchange online) only as a backup, so whenever his on-premise goes down, clients will connect to office 365 and keep using emails, is that possible?

Thanks

Use Office 365 as a Backup

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

Microsoft Office is an integrated suite of applications that includes Outlook, Word, Excel, Access, PowerPoint, Visio and InfoPath, along with a number of tools to assist in making the individual components work together. Coding within and between the projects is done in Visual Basic for Applications, known as VBA.

Microsoft Office

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.

Exchange

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.