migrate from Exchange 2007 to office 365

i want to migrate around 40 mailboxes to Office 365 from a Exchange server 2007 to Office 365 what is the best way to do this. without using 3rd party software.
Joris DijkAsked:
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Naveen SharmaCommented:
Migrate smoothly and swiftly from on-premise Exchange Server to Office 365:
https://www.kerneldatarecovery.com/blog/migrate-smoothly-and-swiftly-from-on-premise-exchange-server-to-office-365

However, your best approach is to follow Microsoft Exchange Server Deployment Assistant to get step-wise checklist: https://technet.microsoft.com/en-us/office/dn756393.aspx
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MASEE Solution Guide - Technical Dept HeadCommented:
You can do a cut off migration from onpremise server to Office 365.
Please check this for details
https://blogs.technet.microsoft.com/canitpro/2013/11/19/step-by-step-migrating-from-exchange-2007-to-office-365/

If you want to have Hybrid.
You have to configure ADconnect first and run Hybrid Configuration Wizard.
https://blogs.technet.microsoft.com/mspfe/2013/10/08/exchange-2007-on-premises-to-hybrid-deployment-with-office365/
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Joris DijkAuthor Commented:
im going to use the cutover migration because i dont need 3th party software for that.
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