In many Notes migrations, the UPN and email address may not match. You may set the UPN easily. However, sAMAacountName may not be as same as the first part of the email address.
Office 365 builds the default @company.onmicrosoft.com address with the sAMAacountName. This is useful for mail routing before a cutover, such as a pilot group.
Is there a way to include sAMAacountName to the drop down menu when choosing the Build Address From drop down?