We are migrating from Domino to O365. We are not using OWA. All users access via Outlook 2016. The EV servers for Domino are version 11.0.1. When users try opening an attachment in a message that was migrated, and had been previously vaulted by EV, they get an error trying to hit the url... ex.
Do we need the Outlook Add-in? A specific version? The URLs should be pointing back to Domino EV.
That probably is not going to work, but I would start here:
You do need the Outlook client, and you do need to convert shortcuts.Using O365 with on-prem archives might be a challenge in general. I would investigate the option to migrate the archvies to the O365 mailboxes, or perhaps to EV.Cloud.