Interesting perspectives from Forrester, although I'm surprised they didn't include Yahoo/Zimbra in their assessment
Taking on the enterprise email market is gutsy for Cisco. Many have tried. The role call of companies that have shown sustained, significant success is short: IBM, Microsoft, Novell. Tough crowd. Then again, Cisco is a very tough competitor, too. And they bring some assets. WebEx is a very strong, well-respected brand that has great relevance to knowledge workers. They have mind share. Certainly Cisco has the resources to make this happen. They can build the data centers, write the code, make additional acquisitions as needed. And if email is moving to the cloud, it could be just the disruption that could drive a new competitor like Cisco into the thick of the race.