Either save the attachments to the local drive and then right click on them and select Properties and click on the Unblock button, or in Word, go to File>Options>Trust Center>Trust Center Settings>Protected
View and uncheck the "Enable Protected View for
Outlook attachments" item (and the others if you wish)
This suggestion helped me, but in fact it was changing the setting for "Enable Protected view for files originating from the Internet" that allowed me to open the file. I'm remotely accessing an Outlook account via the internet so I guess that tags the file
as having 'originated from the internet'.
However looking at this more closely I took Doug's suggestion of using the 'unblock' property for the individual file and for now I've reinstated the general Protected View settings for files from the internet and from Outlook, which retains the default
levels of protection but this still allows me to look at specific files, and I'll keep this style until I see a need to change anything more comprehensively. I can individually scan any downloaded files I need to look at using my anti-virus software.
All this advice was useful and prevented me having to potentially spend quite alot of time reinstalling software, search and look for updates etc. when generally the software is working and for now I want to just focus on the work I need to do in the first
instance. I'll look into updating the software or installing better plug-ins, .dll files or drivers or any other files at a more convenient time.
Thanks Doug for your very helpful advice!