The following options are most valuable for this migration scenario:
- Set to use impersonation at the Source. Checkmark the Use impersonation at Source Read the How do I migrate to Exchange or Office 365 using impersonation?article for more information.
- Set to use impersonation at the Destination. Checkmark the Use impersonation at Destination Read the How do I migrate to Exchange or Office 365 using impersonation?article for more information.
- If this is a large migration project, the value for maximum concurrent migrations, under Advanced Options, should be set to a maximum value of 25 concurrent migrations, in order to gauge the tenant migration capabilities. If successful, this value may be increased incrementally.
- Under Support/Support Options, add the following: RecipientMapping="@sourcetenantname.onmicrosoft.com->@destinationdomainname.com"Read the How do I add Recipient Mappings to a project? for more information.
- The RecipientMapping above is just an example; do not copy this verbatim. It needs to be changed to reflect the sourcetenantname.onmicrosoft.com account name and the customer Destination domain name.
- More than one remapping expression can be used.
- This is a very important step for Office 365 to Office 365 migrations. It ensures that emails have the ability to be replied to, even after the Full (Delta) migration has occurred because they will be mapped to the new destination domain name, rather than using the old sourcetenantname.onmicrosoft.com account name (- which will no longer be available, once the tenant is retired).