My work around appears to be work now. Send and receive runs once every 90 minutes.

Interestingly, now that I had gone off line, every time I start it asks me if I wish to go online. Once I go online, it still asks me next time I start up if I wish to go online. I cannot find an option to change this behavior. Yet more rubbish software design from Microsoft.

If it was a Mac I was using at work and I was using Mail, then I could just use an add on which would do a far better job than anything I've ever come across from Microsoft and their Outlook software.

However Mail has other problems all of it's own, so I no longer use Mail at home and couldn't be certain it would scale well in a multi-user mail server type environment, in which the company I work for operates. I reverted to using Thundebird at home, which to be fair isn't that great either for my needs but what I'm using for now.