As Karl mentioned above, SMTP archiving is not certified on a x64 bit system. The error is referring to the SMTP component. Have you disabled this prior to the upgrade?
You can find out how to do this from the "Setting Up SMTP Archiving" manual. I've also copied the text from this doc below:-
To stop the SMTP archiving process
1 Log on to the SMTP archiving computer.
2 Do one of the following:
â– Click Start > Programs > Enterprise Vault > SMTP Archiving
Configuration
When you are prompted, enter the full path to the SMTP archiving
configuration file, for example C:\Program Files\Enterprise
Vault\EvSmtpArchiveConfig.ini
You are then asked if you want to disable SMTP archiving. Enter Y.
â– Or open a command prompt window and change to the Enterprise Vault
installation folder.
Then unregister the SMTP archiving process by entering the following
command:
EvSmtpArchiveConfig config_file /U
Where config_file is the name of the configuration file. The default file
is EvSmtpArchiveConfig.ini.
SMTP archiving parses the configuration file and reports any problems. If
the parsing is successful, SMTP archiving indicates that SMTP archiving is
disabled.
Try to upgrade again.