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Check out gmail and similar mail services.

I’m not sure but I have heard that this can be done in little standard manner using JMX and MBeans. Its very vague but if you can explore, please do share with Forum.

Another solution could be to...

You can use Apache web server to proxy your ancient server. You can deploy your log in application in the web server which will fulfill authentication part of your requirement.

Another solution is...

As you said only BO’s are same. So, I think you can have separate simple java project for BO’s and use that as “shared library” in projects wherever you require it.
Do not use the BO jar in the...

Do you mean to say that view and controller layer is different for both the type of client however model layer is same? If yes, I think one of the approach could be that you still can have two...

You probably may look at the similar concept implemented in Kingfisher website while booking the ticket.