"Unrecognized error 0x80044605 has occurred." This seems to be CSCee49775.
Based on the error 0x80044605 while importing the user in Unity from Domino.
Please verify two things .
Is the User 's mailbox which is residing on Domino server is co-located with Unity server?
Does the Domino server has DUCS installed on it, from which you are importing this user. ?
Also send me the GUSI info from the Unity server.