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Very helpful. Thank you for your prompt response.
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Very helpful. Thank you for your prompt response.

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We have currently started the migration of &nbsp;Exchange 2010 on-premises to O365 ...but the migration of our mailboxes hasn't started yet. <br />
How do I migrate one mailbox from our existing Exchange 2010 SP3 server to Office 365 without affecting other mailboxes ? <br />
I wanted to migrate only one user without losing his email and / or affecting other mailboxes but there is different option for it ...<br />
I'm not sure how to do this-- step by step other than using the PowerShell command line...
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We have currently started the migration of  Exchange 2010 on-premises to O365 ...but the migration of our mailboxes hasn't started yet. 
How do I migrate one mailbox from our existing Exchange 2010 SP3 server to Office 365 without affecting other mailboxes ? 
I wanted to migrate only one user without losing his email and / or affecting other mailboxes but there is different option for it ...
I'm not sure how to do this-- step by step other than using the PowerShell command line...

Hybrid Migration : Exchange 2010 SP3 to O365

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.

Exchange

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.