When configuring Notes Migrator for Exchange for the first time and specifying the Exchange Server information, the following error may be seen:
[8803-94-9-81002746] Unable to open server 'Exchange Server'
ConfigureMsgService(MSEMS). Check mailbox or SMTP address.:
This issue is caused because the 'Administrator SMTP address' specified does not match the primary SMTP proxyAddress for the administrative user name.
Verify the SMTP address specified is correct and a valid primary SMTP address.