To answer your questions, out network is completely private. No connection to the Internet. No means to import data from the outside world. Security patches are thus not a problem. The reason why we do not install them all is because our system runs some special security tools which do not always like those updates...
...could these tools be part of the problem? For example, do they interfere with Word macros (remember that Trados uses macros for integration with MS Word)?
We talked to Trados but they do not support 5.5 anymore. And buying 7 will take at least a year. So I have no choice we have to find a way to make our dear old 5.5 work until then.
One solution I can think of is to hire the services of an independent consultant - contact me through my profile if you think this is feasible.
Yesterday the head of the IT section asked me to provide her with a list of the problems which have not happened yet but which might occur in the future if we continue to work with 5.5 ?!?!?! OK, I know what you must be thinking... But this is not a joke ! Not easy to write up a list of things you are not aware of, right ?
I thought somebody here may have gone through the same problems and may be able to "tell me in advance" what may arise in the future if we keep on using that 5.5.
Not entirely impossible, but very unlikely without knowing your environment in detail.