For no apparent reason my Windows 7 Live Mail stopped sending & receiving.

I noticed that the menu bar button read 'Go Online' instead of the normal 'Go Offline'. Clicking 'Go Online' produced the normal call out box seeking confirmation that I wanted to go online. However, clicking OK achieved nothing.

I also tried the icon in the status bar with the same result. Callout box appears - but nothing happens

Very grateful for any suggestions
Many thanks William

PS: I can check any answers at my webmail