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Just to add my 2p on the outlook add-in issue.
I have done a trial 4.8 to 6 install on a handful of machines and have had this issue on two of them.
The last one I was trying to work around the blank sending of emails via Outlook/Exchange server by deploying with the mail scanner turned off. I think this may also have been the case with the other machine that I had this issue. Another machine that I tried it on deployed fine.
I don’t know if this Outlook 4.8 addin not being deleted is something to do with deploying v6 without the mail scanner.
My experience is that the Outlook 4.8 plug-in is actually cached on a per users basis. So its old presence needs to be deleted from every user profile on the machine.
After disabling the Avast 4.8 outlook add-in and closing Outlook, I rename extend.dat to entend.old_dat for every occurrence of it %localappdata%/microsoft/outlook (or presumably %appdata% in XP)
Quite a lot of manual intervention. I have an upgrade from 4.8 to 6 for nearly 50 machines that needs to be done in the next couple of weeks and for the sake of the school, I hope that it can all be done centrally and cleanly without every student getting some error or prompt when they next use Outlook.
The reboot is fine as the ICT teacher can do that, but I cannot see her going round and cleaning Outlook up for every student on every machine. Any my time of voluntary and I’m certainly not going to make a special trip to the school just to sort out something caused by two bugs in a so called business grade solution.