Keylabs was spun off from Novell years ago and initally funded by none other than the CEO of Novell(correct me if i'm wrong). The people that started Keylabs were former Novell internal test-lab employees. So yes, I think we could assume a little bias here.
I have actually rolled out an exchange site of that same scale but for my brother-in-law's small business I setup qmail, www.qmail.org, as my first Linux project. Its great and easy to manage, I have rebooted the box maybe once and that wasn't for any problems with qmail. There is a mailing list where you could ask about scalabilty. All Exchange sites of that considerable size do it with a multitude of servers. I think you can make several qmail servers talk to each other. I wish there was something in the open-source community that had all the features of Outlook(except Journal). That's what is really needed to switch the PHB's around.
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Keylabs was spun off from Novell years ago and initally funded by none other than the CEO of Novell(correct me if i'm wrong). The people that started Keylabs were former Novell internal test-lab employees. So yes, I think we could assume a little bias here.
I have actually rolled out an exchange site of that same scale but for my brother-in-law's small business I setup qmail, www.qmail.org, as my first Linux project. Its great and easy to manage, I have rebooted the box maybe once and that wasn't for any problems with qmail. There is a mailing list where you could ask about scalabilty. All Exchange sites of that considerable size do it with a multitude of servers. I think you can make several qmail servers talk to each other. I wish there was something in the open-source community that had all the features of Outlook(except Journal). That's what is really needed to switch the PHB's around.