Hello, we just recently switched to Office 365 and migrated all of our email from Exchange. We have a file server and I would like to utilize our 1 TB of storage through Office 365 by migrating our files to SharePoint online. Does anyone have any recommendations or best practices for this? I am open to suggestions. We have a mixed environment of Windows 7 and Windows 10 computers.

2 Spice ups

Don’t migrate- get the business to think about the layout that meets the business processes now, not whenever the fileserver went I
Now is a good time to review what data you have, how & where you store it and for how long

1 Spice up

Please refer to below link:

Migrating File Shares to SharePoint Online:
http://expert-advice.org/office365/sharepoint-file-share-public-folder-migration-sharepoint-online/

You can also automate this migration process by using migration solution like; SharePoint Migration - Migrate SharePoint Content to SharePoint Online