You can share documents for co-authoring with external collaborators who don't exist on iManage Work Server. To collaborate, you must set up OneDrive for Business. For more information, refer to Installing the Co-Authoring add-in and Co-Authoring FAQ.

If the external collaborator's email is not in Microsoft 365 email directory of the firm, Microsoft sends an invite directly to the user, and you can view it in your sent items folder. If you review the email invite in Microsoft Outlook, the external users' email IDs aren’t displayed in the email message. If an external user is in the firm directory but not registered in the iManage Work Server, the user's email address is displayed in the email invite.

If you reopen the Invite people dialog to invite more users, the external users email addresses are displayed in the Shared with list.

The external collaborator receives an email that contains a link. The collaborator can select the link, and then enter their Microsoft 365 account credentials when prompted to open the document. You receive an email notification when the external collaborator accesses the document.

External collaborators are referenced by their email addresses in the Revision History and Timeline of co-authored documents. For more information, refer to Viewing the document revision history.