We have SBS 2003 and we are about to move to Office 365. Email data has already been migrated but we have not changed the MX records yet.
I am very confused about the actions after the cut off – I want to know what steps do we have to take after changing the MX records??
On some documents it is said that we have to un-install Exchange 2003 from SBS. On another it says just delete the existing mailboxes. We do have a few LOB applications which may send notifications via email, also a scan-to-email function on our printer device and the SBS 2003 itself sends reports via email. Emails should be delivered to Office 365 mailboxes once on-premises Exchange is ‘gone’.
Microsoft KB article http://support.microsoft.com/kb/2600912
suggests creating a SMTP Relay under IIS. But on an Exchange Server you cannot create a Virtual SMTP Service in IIS because that function is managed by ESM (Exchange Server Manager).
Can you please provide some guidance on what and how do I do it.