We use tools so that users won’t need to manually move their Outlook tasks, appointments, and contacts. However, in some cases, certain items may need to manually moved from the legacy account to a new home in Office 365. For example, items over 25MB will not automatically migrate in an Exchange migration, because Exchange Online won’t allow files of this size. Sometimes users must create a new Outlook profile in order to connect properly to Office 365, which might require exporting e-mail signatures or mailbox rules. In all these cases, we’re available to support your users in performing the necessary tasks.