Zoho Outlook Plug-in suddenly gone

Zoho Outlook Plug-in suddenly gone

When I opened Outlook this afternoon to check my mail I noticed that the Zoho toolbar was missing. It was there last night when I shut down the computer, but now I can't find it anywhere.

It's late on a Friday, so it's possible that I've lost my mind. And I'm a new Outlook user - I specifically bought Outlook 2007 just a week ago to test the Zoho plug-in for a client. I have looked for ways that I might have turned it off by accident, but I don't see anything to turn it back on.

The contacts that had been synced to Zoho are still marked with the Zoho category.

Where could it have gone, and how do I get it back?

I'm running Outlook 2007 on Windows XP.