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Planning to create same ids as old server and merge data at later stage. Would that be ok?
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Planning to create same ids as old server and merge data at later stage. Would that be ok?

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Yes. that will work. Make sure your users understand your plan.
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Yes. that will work. Make sure your users understand your plan.

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Thank you, and I was happy to help.
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Depends on how you are migrating emails and users? do you have hybrid integration or you are using IMAP Migration?
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Depends on how you are migrating emails and users? do you have hybrid integration or you are using IMAP Migration?

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I would only keep pst files of old emails. To upload and merge them directly to office 365
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I would only keep pst files of old emails. To upload and merge them directly to office 365

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Already started moving from physical servers to office365 E3. As migration may be hectic at the moment. Is it the good idea to start email services at O365 and migrate old pst of email account at some later point. Would that make any difference?
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Already started moving from physical servers to office365 E3. As migration may be hectic at the moment. Is it the good idea to start email services at O365 and migrate old pst of email account at some later point. Would that make any difference?

Migrating to office 365 E3

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.

Email Servers

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

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.