Atlassian Cloud Migration and the Legacy Environment

Migration will happen in two groups. See the timeline section on the Atlassian Cloud Migration Project webpage to find which group your projects and spaces are in.
Headers – Migrated spaces and projects will contain a header with migration information. One.WUSTL will also have an announcement to provide migration information.
Read-Only Legacy Environment – Spaces/Pages in the legacy environment will be changed to read-only immediately after migrating to Cloud.