UPDATE: IBM has posted instructions and a tweak for your Lotus Notes client on OS X 10.8. I recommend following the instructions posted by IBM, rather than my tip below.
This tip comes courtesy of an excellent suggestion by @stuartmcintyre…
After installing the OS X Mountain Lion GM seed, Lotus Notes gets moved into a Lotus Notes folder. On my machine, double-clicking on Notes.app within the folder causes Notes to start but when I double-click on an email or calendar appointment, Notes would crash.
A solution is to move the Apple Notes.app file into a folder and move Lotus Notes back to being the Notes.app application (into the same location as it was before the upgrade to Mountain Lion).
Finder won’t allow you to move or rename Apple’s Notes.app so terminal is needed:
Open Terminal in Mac OS X then type the following commands:
sudo mkdir /Applications/Apple
sudo mv /Applications/Notes.app /Applications/Apple/Notes.app
sudo mv /Applications/Lotus Notes/Notes.app /Application/Notes.app
This has worked well for me, but as always, make sure your backups are up to date before doing this!
Thanks Stuart!











Thank you for this
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Alan, I have two presumptions after reading this:
1. This solution presumes one would not be using the Apple Notes app.
2. Subsequent updates to either program from their respective creators would probably cause A Great Disturbance in The Force™
Yes?
For what it’s worth, this could cause problems if Apple releases an update to their Notes.app. Apple likes their apps to be where they put them – if you move the iWorks apps out of the iWorks directory, it fails to recognize and update them (at least in Lion). It’s quite possible that Software Update will either not recognize that (Apple) Notes.app is installed or, worse yet, mistake (Lotus) Notes.app for it, and install the Apple update over it.
Hi Alan, tx for the fix. There actually appears to be an even easier one though, I renamed the (Lotus) Notes.app to LNotes.app, moved it back to the Applications-folder & it started up without any issue. Cheers, J