Try a Free Method to migrate PST to Office 365 Mailboxes

1. Click the File tab, click Open & Export
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2. Select Import/Export.
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3. Select Import from another program in the Import and Export wizard
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4. Click Next.
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5. Select Outlook Data File (.pst) and click Next.
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6. Browse for the Outlook PST data file select it and click Next.
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7. Set Options according to your preference
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8. Click Next.
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9. Choose the Import items to the same folder in option and select the Office 365 mailbox
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10. Click Finish.
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After analyzing the process of the Manual method, I would say that the manual method is a techie and large process. On the other hand, many third-party tools are available which provides a simple, fast, and reliable solution to import PST to Office 365 migration, Live Exchange server, new PST, EML, and MSG. Also, you can get Office 365 migration support for them. 

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Lewis

For IT admins taking this on for the first time, there is a steep learning curve. Here’s a quick step-by-step guide to help you on your way.
1. Face The Realities Of Migrating To Office 365
Any organization with established business processes, current on-premises infrastructure, and historical data under management faces a significant planning exercise in evaluating the shift to Office 365, along with a set of discrete tasks in actually doing so. There are numerous critical decisions to make while planning the shift to Office 365—including how to achieve value from doing so, the approach to take, whether to involve an external consultancy and the selection of third-party migration tools.
2. Set up for how you will use Office 365
Office 365 provides an array of capabilities for enabling communication, collaboration, and compliance for organizations. An early task to complete in evaluating the shift to Office 365 is how your organization will make use of the capabilities on offer.
3. Procure the Office 365 plan that makes sense for your organization
Microsoft offers a number of plans for Office 365, with increasing levels of capability and service coverage. An organization that wants to use a hybrid configuration between on-premises servers and Office 365 must select a plan that supports Azure Active Directory to enable administration tasks and seamless identity management between the two environments.
4. Complete pre-migration checks and develop a migration plan
Delivering a seamless migration to Office 365 is pretty straight-forward once all the thinking work is done. As Microsoft says, most organizations will have to spend a lot more time planning their migration than actually putting it into practice. Here are the tasks to work through in checking your current environment and developing a plan for migrating to Office 365.
5. Migrate to Office 365
Office 365 cloud migration is usually done across several phases, with organizations frequently shifting user mailboxes to Mircosoft Exchange Online first, then migrating other aspects of Exchange, and finally looking at the other capabilities on offer.
6. Drive effective use and achieve business value
Once you have migrated to Office 365, the ongoing challenge is to drive effective use and achieve business value by incorporating appropriate Office 365 capabilities into day-to-day work.

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Lewis

These are some points that can help your business if you do SEO for your website:

• It lets you drive targeted, organic search traffic that is relevant to your industry.
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• It helps your brand gain higher visibility and more exposure.
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• It makes it easy to attract people that will convert into customers/clients.
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Regards,
Lewis