I'm the IT admin for a small accountancy firm (2 users) in Sweden. Lately I have been looking for alternatives to our current email hosting provider, which happens to be our ISP. The main motivation for wanting to switch is that reliability has been a reoccurring problem especially with emails "disappearing", i.e. incoming emails not reaching the firm's users. The ISP is one of the largest in Sweden and I have submitted support tickets several times without any resolution.
I have looked at Google's premier service Google Apps, but considering Google's privacy issues I'm very hesitant about switching to their service. I read their Terms of Service and although they are different from Google's free service which clearly states that they own your email etc I still don't trust them with the company's email.
I think that Zimbra might be a good fit and I have thought about running it in our virtual environment on VMware ESXi 4. However, this would require an upgrade to a more expensive broadband offering from our ISP, as the current one does not allow hosting your own email server. Also, hosting the Zimbra service ourselves might be unreasonable for such a small company. Alternatively, I have looked at hosted providers in Sweden and found Redbridge who is on Zimbra's partner list.
Basically, the users will not take full advantage of Zimbra's feature set, as they will "only" be using the email component via local email apps. Calenders, Address Book etc are all kept separate for each user.
I have not made any decision yet and would like to hear from the community here what your thoughts are on what I've described above in terms of usage, hosted or not and whether Zimbra is an appropriate solution.