For the selected users, Domino Upgrade Services migrate only those messages that were not previously migrated. Notes IDs are not created and the Domino Upgrade Services do not modify the users' Person documents.
For example, you have created a Notes account and mail file for Mark Richards, a cc:Mail user. Mark receives additional mail in his cc:Mail mail box, and you need to migrate these messages and folders to his existing Notes file, while preserving his Notes messages and folders. You can migrate Mark's new cc:Mail messages using the "Convert Mail ONLY (Notes users and mail file must already exist)" option.
You can use the "Convert Mail ONLY" option only if the users selected for import in the Available people/groups dialog box are already registered Notes users. Furthermore, if you use this option to convert additional mail for migrated cc:Mail users, the users' cc:Mail names must exist as secondary entries in the User name field of their Person documents.
When this option is enabled, the migration tool processes only mail information, regardless of the other migration options you have set.
Note The options "Convert mail" and "Convert mail ONLY" are mutually exclusive. An error message appears if you select one of these options and the other is already selected.
Access rights required to migrate mail to an existing mail file
To migrate mail to an existing mail file, you must have Manager access in the ACL for the file. However, by default, only the owner of the mail file has Manager access. When you first migrate users, consider whether you may need to migrate additional messages for these users later. If so, modify the default access rights that apply to the user's mail file.
For information about how to modify the default access rights when creating a mail file during migration, see the topic Add administrator to a mail file access control list..