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:

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
MASEE Solution Guide - Technical Dept HeadCommented:
You can do a cut off migration from onpremise server to Office 365.
Please check this for details

If you want to have Hybrid.
You have to configure ADconnect first and run Hybrid Configuration Wizard.

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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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