Microsoft's excellent choice of agency paid dividends for their 'Signposting' advertising campaign, resulting in a successful, and thoroughly entertaining series. 

If you need technical support, but don't call the right people, how do you expect to get the right answer? This was the problem MIcrosoft's professional users experienced. The organisation is so large, that they had different telephone support numbers for each product.

So they created Microsoft Guideline, a new directory service for IT professionals - or as we put it; "Your red, blue, green AND yellow pages".