When Your Groove Account Grows Old...

I've used Groove a number of times over the last couple of years but haven't used it much this year until this evening when I thought I'd dust off the covers and give it a go for a project I'm embarking on (more on that later).  Anyhow I have recently changed users on this computer and I haven't used Groove under the new account.  Luckily I had previously emailed my Groove account to myself so I figured I could just use that account information to get me up and running again.  Unfortunately this failed with a message saying that the account was too old:

"Saved account for Nick Randolph is too old and cannot be installed. Please import a more recently saved version of this account."

Huh, surely not..... Luckily I hadn't removed the previous user account off this computer so I went trawling through the application data folder to see whether I could manually restore the account. It turns out that there is a folder "C:\Users\<user>\AppData\Local\Microsoft\Office\Groove\User" but unfortunately copying this from one user to another generates a warning message claiming the account is incomplete, an exception and then Groove bottoms out completely.  As a last resort I decided to copy the entire "C:\Users\<user>\AppData\Local\Microsoft\Office\Groove" folder across to the new user and this worked a treat!  I'm all to go with all my old workspaces.