Archive Shuttle has ability to provision mailbox in Office 365 and set flags like “Legal Hold”, “Hide from GAL”, etc for “Leavers”, or “Virtual Journal” type of migrations.
There are several differences between each Office 365 Plan/License Options and it can be check here or here.
The biggest difference from the migration perspective is the mailbox size/storage limits as the data will be migrated there:
Therefore, we are recommending to use Enterprise E3 or E5 licenses for migration as “Leavers”, in case you are sure that the mailboxes will not exceed 50GB, you can use E1 license.
If you have any questions, please contact support for more details.
Note: Review this associated article.
Note: Confer with Microsoft to determine whether the terms of your licensing agreement are impacted by the legal hold feature.
Note: We also support the government equivalent of each of these licenses mentioned in the article.