Microsoft 365 migration

A local organisation of approximately 100 users was running all their infrastructure onsite. Their mail server was in desperate need of an upgrade. Working with them and looking at a number of on-premise and cloud-based solutions, we settled on Office 365 with E1 licences to start. We successfully migrated all mailboxes in one weekend, using custom PowerShell scripts to migrate from Zimbra to Exchange Online with all permissions intact.