No, not all our Notes servers are used to host mail files.
We have a lot of them being used strictly as Notes based application servers.
SR systems, project tracking and such.
Our actual mail servers host roughly 1000 +/- mail boxes each.
The mail file size limits were only recently introduced because they were getting out of hand.
The Exchange portability was in reference to the integration with AD and the lack of the need for an ID file to retrieve your email. Log into any systems with an Exchange client and you can check your email.
We now enforce local replicas, which make putting your ID file on a USB thumb drive and hitting your email from another systems all but impossible.
That is unless you like dragging a copy of your mail file. notes.ini file(only needed if you have specific servers you need to use) and desktop file along with you on your thumb drive. I've had to do it before... it sucks.
As for Web Sphere, if you're ever presented with it as an option, choose something else.
Very bloated and tons of overhead required to make it work properly.
We've been using it since the early days and we have finally had enough and are dropping it. We could never get it to handle the kind of capacity we needed to run our web based programs.
I'm not against the use of JAVA, however IBM's decision to use it heavily in the newer version of Notes was not a smart choice. Great if you use *nix based desktops, but we live in the real world and have Windows based desktops of one flavor or another that use AD for authenticating to all of our systems. We all know how Windows systems just love JAVA.
We're however going to Sun and lightweight JAVA as our Web Sphere replacement. Those are all Sun systems anyway, so it makes perfect sense.
Again, I cannot say who I work for publicly as I will get in a load of trouble.
Yes, they do monitor our activity on the web and know that I'm posting here. As long as I don't get specific, they are cool with it.
Understanding the nature of my business would make you go "ah I get it".