This is a short-term issue, but if you are used to replying to, or forwarding, email from a shared email account you may find this fails with a ‘permissions’ error.
In the short-term you will need to click the ‘from’ box and select your own name for this to work
This will be fixed once the move to the new Exchange Server has been finished but that is likely to be a few weeks away.
If you really don’t want to do that, use the Web form of the email because that will work as before. Of course, there is an added complication – how do you find the Web form. It will look like this:
https://exchange.canterbury.ac.nz/owa/collections@libr.canterbury.ac.nz/
where the collections@libr.canterbury.ac.nz part gets changed to the shared email account of interest. You use your own login.
If you don’t know what the underlying email address is, I can find that for you.
Peter