I previously asked this question and have carried out the following recommended actions.

After a break in a computer free zone I have carried out the following tests as recommended.

1. Accessing my Outlook a/c using a different computer and different service provider. Outlook is O.K

1. Accessing my account using my computer and using a different service provider. Outlook is corrupt.

2. Cache/cookiies cleared from Firefox 24. Outlook is corrupt

3. Latest version of Firefox is installed. Outlook is corrupt.

The conclusion I would draw from this is that the problem originates in my computer.

Is there anything else I can try?