have you looked at openchange http://www.openchange.org/index.html It's been a few years since I looked at it but the goal is to create a exchange server replacement.
On Sat, Feb 8, 2014 at 11:34 AM, Nico Kadel-Garcia <nka...@gmail.com> wrote: > Whoops, sorry! I thought you were looking for an AD replacement, not > an Exchange replacement. > > To replace Exchange, run, do not walk, to Google Apps for Business. It > works very well, you don't have to maintain your own expert IT > infrastructure to deal with the vagaries and backups and security of > email handling, and their uptime exceeds that of any internal business > email setup I've ever seen or helped run. You lose Outlook based > calendar functionality, but you gain document sharing and > collaboration to replace emailing bulky email documents around. And it > plays very, very well with Linux clients such as Scientific Linux and > even cell phones, unlike the Exchange suite. The spam filtering is > also *ery* good. > > Unless you've got some very large demands for customized internal > services or security far beyond that of most small shops, don't burn > your time on setting up your own messaging or collaborative suite. > Between managing high reliability services, backups, denial-of-service > attacks, system security, customization requests, and migrating users > to new tool suites, you'll burn up any benefits from having it in > house with months, if not within minutes, of first running it in house > in a small environment. > > If you *have* to continue with Outlook based clients, especially for > calendaring, look at Microsoft's "Online365" services. > > I'm afraid I can't recommend the locally installed, Linux based, > "messaging suite" replacements for Exchange. I tried Zimbra under > RHEL/CentOS some years back, and rejected it as too bulky and far too > expensive in engineering time to maintain. I hope it's gotten better > since, but it suffered from the same problem as Exchange: awkward > integration of conflicting components and their requirements. I don't > expect the mentioned "Zarafa" tool suite to do it any better, but I'd > be curious to see more recent experience with either. > > Nico Kadel-Garcia <nka...@gmail.com>