Are they linked clones or full desktops? You obviously wouldn't be able to take advantage of any of the new features that were dependent on the agent.
These are full desktops. All manual and dedicated.
We are going that way but I have to get it up to a decent standard first. 3.1 is a tad old!
It's a slow road getting all the new goodness in here.
I haven't done it with a gap that large but I have used old agents with a new broker/client. I don't anticipate that you will have any issues with basic functionality such as connecting to the desktop.
Thanks for that. I shall let you know how I get on!