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Time Estimate Please for mailbox migration

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Greetings Microsoft 365 online community.  I have been asked to migrate 3 mailboxes and 1 public mailbox over to a cloud service.  I am currently considering Office 365.  A staged migration appears to best fit the description of what we are looking to do.  We currently are hosting Exchange server 2007.  Would you be able to give me a time estimate (in hours) as to how long this migration will take.  Of note, one of my former colleagues previously attempted the migration and hit an impasse.  Thank you for any information you can provide. 
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  • Hello Kirk,

    Thank you for your post.

    The time taken by migration process can be related to various factors, for example, the size of mailbox, network bandwidth, performance of exchange server in on-premise domain.

    However, for your situation, since there are only 4 mailboxes (3 mailboxes and 1 public mailbox) need to be migrated, you can migrate the emails for users by exporting/importing .pst file referring to article below.

    Use Outlook to Move Data Between Accounts
    http://help.outlook.com/en-us/140/dd401503.aspx?sl=1

    By the way, if you would like to migrate mailboxes for users with Staged Migration, please following detailed instructions in following article to do it.

    Migrate a Subset of Mailboxes to the Cloud with a Staged Exchange Migration
    http://help.outlook.com/en-us/140/ff959224.aspx

    Thank you.

    Jack Sun

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