Hello Fremont,
I assume you used to migrate the data from Domino to Exchange and converted the migrated items with the tool named 'EVDominoExchangeMigration.exe' (at least for the Domino Archiving).
In order to still access the migrated domino items from Outlook you need a properly configured Lotus Notes installed on the EV Server, this technote well explains the errors of a scenario where Lotus Notes has been removed https://www.veritas.com/support/en_US/article.TECH205992
At the end of the technote there's the explanation about how to reconfigure Lotus Notes on the EV Server (if any Domino Server is still active in the environment I would prefer the first option):
**
If any Domino Server is still available in the environment perform the following:
1) On the EV Server install Lotus Notes in single user mode
2) Configure Lotus Notes connecting it to any available Domino Server
3) Restart all the Enterprise Vault Services and the IIS Admin
4) Test from Microsoft Outlook the retrieve and restore for previously failing items
If no Domino Server is available in the environment and there is not way to establish a connection from the newly installed Lotus Notes perform the following:
1) On the EV Server install Lotus Notes in single user mode
2) Restore from backup the Lotus Notes configuration files as follow: user.id, notes.ini and the entire Data Folder (Data folder might contain the user.id file already)
3) replace the aforementioned files and folder on the newly installed Lotus Notes replacing any existing files
4) Restart all the Enterprise Vault Services and the IIS Admin
5) Test from Microsoft Outlook the retrieve and restore for previously failing items
**
If you are upgrading from 11.0.1 I think you have all the configuration files listed above so you don't need to re-install any Domino Server.
Massimo
