Hi,
migrating off of Lotus Notes is as straightforward as it is with Exchange.
Group scheduling is a core function of Scalix and you will find it as easy to use as Notes. We support Outlook as a Windows client with our Service provider, so you can use a regular Outlook client against a Scalix server. People wont be able to tell the difference. People using a web browser and SWA will also think they are using Outlook, it's that similar.
To ease migration, setup a LDAP synchronisation between Notes and Scalix. On the Notes side, nothing more than "load ldap" is required. On the Scalix side, a synchronisation agreement needs to be set up, but we'll do that when you get there.
For migration of messages I would recommend imapsync, it's free, fast and faultless. It does not migrate calendar data, though.
http://directory.fsf.org/imapsync.html
I might be biased, but I have 13yrs of Notes under my belt dating back to Notes 3.1
Cheers,
Sascha.