Initially, install & launch GainTools Exchange Migration Software.
![install exchange migration](../images/screenshot/exchange/install-exchange-migration.webp)
Click on Add source button, select Exchange Server mailboxes and add login details.
![select imap server login](../images/screenshot/exchange/add-source-button.webp)
Preview Exchange mailbox items and select items using filters to migrate.
![preview select items](../images/screenshot/exchange/preview-select-items.webp)
Select Office 365 option and enter its login details. You can also select other options.
![select office 365 option](../images/screenshot/exchange/select-office-365-option.webp)
Now, check map mailboxes option, if required. This will start the migration and offer you report of the process. Click the Finish button when all is done.
![start migration](../images/screenshot/exchange/start-migration.webp)