I received a reminder that my Grime Fighter subscription was due for renewal - I decided to run the programme (I can’t remenber if I had done so before!). After reboot, Outlook didn’t work so I searched and found this forum. I did as suggested and undid the changes and all is OK. I certainly won’t be renewing my subscription. There doesn’t seem to be much advice/help as to what Grime Fighter actually does to Outlook to cause this problem or how to solve the issue without undoing changes. There is little point in having a slightly faster PC if the e-mail client doesn’t work.