Our IT department wants to make a change to our website and serve all the pages under SSL (https).
This will be happening at the same time as a move from classic ASP to ASP.Net so the file extensions for non re-written urls will change (this doesn't equate to many).
They will be ensuring everything is 301 redirected correctly.
Even with this I can't help being very nervous about the change.
We have tens of thousands of links to the website gained over many years, and I understand even with 301'ing them they will lose some of their value. We receive tens of thousands of natural visitors per day.
Has anyone done anything like this before, or have any advice on whether it is the right thing to do?