Clustering Lotus Notes and NT

We are looking to cluster NT Advanced 2000 server, and Lotus Notes 5.0 with Notes clustering. The NT Server would be file and print services.
The primary NT server would run with Notes inactive, and the Primary Notes would run with NT file and print inactive. Both would be the redundant of the other.
Lotus says this is possible, MS has not certified. Anyone else with this experience?
Any insight would be greatly appreciated.
Bill Hansen.