Zimbra

Pros

The most I like in Zimbra is:
1. Faster Deliverability of Emails in real time
2. Can add Email Signature to all our emails
3. Can send Events/Meetings Invites
4. User Responsive in design and lite speed software
5. Can use Out of Office option if you're in leave and send automatic responsive email to them
6. Can Import/Backup all emails/contacts with a single click
7. Can search through all our emails by using search options
8. There is an inbuilt Calendar for our quick meetings lookup in it

Cons

Hmm.. At Present, there's no cons or least liked about this software as I have been using it from past 2 years and going with the same speed till now :)

Pros

It is based on Linux, it can do SSO sign-on with Active Directory, as well as most LDAP based authentication directory services. The web mail is full featured, not a light client. They provide both ActiveSync and CalDAV/CardDAV access, which is important for us as a design company using mostly Mac computers.

Cons

The software itself is great. My only issue was for the few times I needed to reach out to Zimbra/Synacor's support, the response time was a bit slow (1-2 days). I assume if this had been an outage and had called in rather than only email my request, I would've received a faster response.

Pros

Its scale-able, robust, secure and low cost. Based on Postfix and other opensource packages it provides good emailing solution. All the included packages are thoroughly tested before included in release. With most of the world going to cloud for email for the organizations need low cost yet secure and scale-able on premise mailing solution Zimbra is a good option. It has very good Web base UI which is very easy to use. There is no performance issues. Visibility with logs is very good . Zimlets are very cool features you can add on

Cons

The support is a bit so so maybe because of change of so many owners of the company. The web ui can use skin option to make it look and feel like different email platform in the market, e.g. if someone is use to outlook or gmail ui then a them/skin could provide that

Pros

Ok lets begin with the good. Zimbra is a suite that comes with the basic calendar, contact list and the ability to create tasks. It allows you to set reminders, tasks and appointments and share them with coworkers quickly. This is perhaps the best features of this software. It is a relatively simple program without all the bells and whistles of the beast known as Outlook. It is the simplicity of this software and security that makes it ideal for our company. We have just migrated to Zimbra and the roll out for the most part was successful. One thing I absolutely love about Zimbra is the ability to set it up in Outlook. This gives me the collaboration within my team using Zimbra and the features I've come to love in Outlook.

Cons

If you are use to the larger and more powerful collaboration suite known as Office 365, you'll be a bit disappointed with Zimbra. Zimbra is not going to search for you, talk for you or keep your emails forever. What you'll find is a simple program that allows you to collaborate with your coworkers and management without the bells and whistles. It can be a disappointment if you're use to a larger suite. Communication is limited to just responding to an email, and emails are set to a 30 day retention limit. You can use a "Zimlet" to capture and save emails however. As stated above being able to incorporate Zimbra into Outlook is a way to overcome some of the limitations of Zimbra.

Pros

1. Specially the optimized nature of it to work on limited or lower network connectivity like VPN,

2. Cost effective and Opensource nature.

Cons

User Interface was laggy sometimes. It has sort of older look and feel compared to other open source email collaboration products.

Sometimes it was not able to filter junk mails effectively compared microsoft exchange service.