Zimbra hosting
Zimbra is a very special application which is actually a webmail server. It was made keeping in mind the need of corporate users to have 
a sophisticated webmail client for their domain names which could provide some important and easily accessible features which are very important for everyday business managing. Zimbra, which was taken over by Yahoo! but is now owned by VMware, is the most popular webmail server.
The problem with generic webmail clients is that they are extremely unstable, issues due to DNS forwarding are aplenty and the contents are also not secure. In addition, most generic webmail clients do not store your exchange emails for more than 24 hours. This is where the need for such a webmail client comes into existence.
Zimbra is the webmail client with some of the most advanced features. Users can share calendars, contacts with their email messages. It also offers mobile support for some of the leading mobile phones and special integration into the BlackBerry Enterprise Server (BES) making it preferred over much of the competition. There is a support section which will provide Zimbra users assistance whenever they need. It is an open source application and is definitively the best paid application out in the market for online email hosting. If you want
your content to be online and want it to be extra secure, obviously you cannot use Outlook and Gmail. There are plenty of operators active which provide effective hosting for your Zimbra powered website.
If you are looking for Zimbra hosting, there is not a best hosting website just yet. You can find a lot of recommendations on the Zimbra website which will also include some client testimonials. This can be very helpful in picking the right hosting service. The prices charged are also not very different since the services provided are not very different as well.
Zimbra can be hosted on-premises or through a hosting partner. Make your decision based on your requirements. A large number of email IDs will need a dedicated on-premises server to ensure maximum security and data availability. Also, your own IT team will have full access to it as the code is all in Open Source. In case of lesser IDs a hosting partner can be given all the responsibility.
Zimbra has been fully customized for hosting on a cloud network as well. This is extremely useful if your work involves the outsourcing of work to another part of the world. All the options are extremely flexible so that you can decide on your own what will work best for you. In addition to all the email accessibility, users can integrate their Facebook, Twitter, Saleforce etc. accounts to Zimbra so that all the feeds are available in one place.
Zimbra webmail hosting solutions are being deployed at some of the largest brand names all over the world who trust this client to manage all their sensitive data.
More info:
Official Zimbra website (Open Source edition)
The profile of Zimbra company
Zimbra VS Google Docs