We have a user that was setup as a mail contact with his personal email address. They also added an internal secondary SMTP address using the companies domain. I received a request to create a new company account for that user. I went into the contact information in Exchange 2010 and tried to remove the secondary domain email address so I can now use that for the AD account. When I click the delete button it does go away but once I click the Apply button it shows backup. I don't want to remove the contact just yet as I want to make sure they are ok with us removing it completely. I added another SMTP address and was able to remove from that contact with no issue. Any idea on why I can remove an SMTP address from a contact? Thanks.