Currently running a hybrid Exchange 2013 environment, with DirSync and ADFS SSO.
We were looking to decommission all Exchange 2013 servers, but as we only have one, following some reading, MS state that one server has to remain if using DirSync and ADFS. Bang goes that idea.
Just to clarify the order of steps to take, for moving all mailboxes/groups to Office 365;
- Disable DirSync
- Remove any users from Office 365, whose mailboxes haven't been migrated already (at present, all staff have been provisioned in Office 365)
- Purge staff from Office 365 recycle bin
- Create staff migration batch in Exchange
- Convert on-premises mailboxes to MEUs, as per https://mikecrowley.wordpress.com/2010/12/09/converting-a-mailbox-to-a-mailuser-and-not-loosing-attributes/
(Has anyone tried these steps with Exchange 2013?)
- Re-enable DirSync
- Sort MX DNS record to point to O365 – how long should we wait before doing this?
If there are any steps that I haven’t thought of, could anyone make any suggestions?
Many thanks.