This could be nothing, or it could be big blow to MS.
http://www.macnn.com/articles/07/02/15/apple.challenges.exchange/Apple challenges Microsoft Exchange
Apple is set to challenge Microsoft's dominance in the enterprise market currently dominated by Microsoft Exchange Server, according to RoughlyDrafted.com. The Cupertino-based company has historically struggled in the corporate IT environment, but is aiming to change that fact with the help of open-source developers. Apple's Calendar Server is set to debut this year with Mac OS X Leopard Server, and will provide an alternative to IT departments looking to finally abandon Microsoft Exchange. Exchange Server is the reason many businesses utilize Windows-exclusive plans, according to the report, suggesting that Apple's new offering could result in massive market share gains for the company. Apple is good at producing click product-oriented commercially developed software, and open-source software is widely known for producing strong server deployments. Apple together with open-source developers could wrest dominance from Microsoft Exchange, resulting in more Mac sales to enterprise customers.