Andrea Tedeschi's new blog essentially covers Microsoft Windows Server (all versions), Powershell and Hyper-V technology. He's only been blogging for few months, but he's enthusiastic and eager to share his knowledge of these systems from Microsoft.

VMware's Team Fusion Blog is somewhat consumer oriented in its approach to blogging. Entries are somewhat short and it contains links to a lot of third party videos on YouTube. Nonetheless, it is updated fairly often if not every day.

Red Hat Corporation maintains a central blog that contains roughly 40 blogs written by staff from throughout the company. Most of the blogs are independtly hosted on other blog sites like Typepad and LiveJournal.

The Windows Server blog hosted by Microsoft is an excellent source of information on Windows Server 2008, Small Business Server, and its new midrange server solution labeled, Essentials.

Microsoft's entire Exchange team contributes to this very informative blog. If you are looking for the latest details on the development of Exchange Server 12 (the 64-it version!), then look no further.