We need to plan users and data migration options to Microsoft 365. User migration means migration of Skype for Business users to Skype for Business online and Data Migration includes mailbox migration and files migration by setting up a hybrid infrastructure for respective service.
Identify data to be migrated and method
We need to understand from where the data is going to be migrated to Microsoft 365. Below are the data migration options available
If Exchange On-Premise – Administrator can setup Hybrid Exchange infrastructure for seamless mailbox migration to Exchange Online.
Mailbox Move Request
PST Import Tool
If SharePoint / OneDrive for Business -> Administrator can move the files to SharePoint online by
SharePoint Migration Tool
Users can manually move the data once they get access to SharePoint Online site.
OneDrive Sync client can be used to move the data
Identify users and mailboxes to be migrated and method
User identification is to find which email systems user is using for example, if exchange On-Premise, we can setup Hybrid Exchange Infrastructure and can migrate the mailbox. If it is a Gmail system, we have the option to migrate the email from Gmail to Office 365. We need to identify the existing email system and do a planning with the available data migration options.
Plan migration of on-premise users and groups
User migration, in other words synchronizing the users to Azure AD / Office 365 can be done via Azure AD Connect. In addition, we need plan the identity model that we are going to use and the authentication method to be planned.
Import PST Files
We can use the Import service to move email (PST files) from your organization’s servers to Office 365. We can ship the files to Microsoft or can upload the file over internet by creating an Import Job to upload PST to Azure blob storage and can map (User Mapping File) each PST file to respective user’s Primary or Archive mailbox.
Navigate to protection.office.com -> Data Governance -> Import -> Create a New Import Job to import the PST into a mailbox.