11-01-2007, 03:00 PM
Join Date: Sep 2004
Location: Los Angeles
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I havent had any problems per say but you have to go through the documentation which 4.1 provides for upgrading, what to see, new features, installation steps, and fixed issues.
Since your environment is small sized, your upgrade time should not take longer than 2 hours (it is good to have that time window in case).
Always have a good backup, a FULL backup.
Take a read through the docs provided and plan accordingly. If you still have questions, you can ask it here...most of them have been answered esp when dealing with Exchange / Domino Upgrades so perform a search.