hey, thanks for the suggestion.

I will try the repair, and .NET fix later tonight, when they finish work.

I noticed some critical errors in the event log, regarding AVG tuneup tools.

So I uninstalled that, and I've asked them to see how they get on today, albeit still receiving the "you're using an old .OST" error. They were receiving the error multiple times (3 i think) - but now they only get it once.

There are no dangers of losing any mail boxes, or outlook current layout, config etc, by performing the repair?

Will let you know how I get on.