My company is an IBM partner, and for political reasons we try to use lotus notes, or like we call it lotus jokes.
The thing is the most un-user friendly piece of software I have ever used.
Email addresses are stored like directory structures that make no sense.
The calendar does not integrate with other meeting requests I get.
The list goes on and on.
Could be just how my company implemented it but man it sucks to use.
Its not even close to google apps like gmail. or outlook and exchange, feels about 10 years behind its competitors.