Well maybe I am looking in the wrong places as I have never heard of the one that Glenn mentioned and the ones that I have looked at were sparse in detail - Glenn's one might actually be what I am looking for, although I do like what I see with Mdaemon.

These are the issues that I want to address. I asked these questions on spiceworks with regards to Mdaemon. Same questions would apply to the Mail server that Glenn mentioned.

I believe that the one that Glenn was talking about provides the possibility of hosting the actual mail server - I am not looking for this feature. I want to use the current hosting provider for reliability reasons. Our internet could go down - they will have redundancies.

1. High cost of mail storage on the Internet Mail server for staff who only use webmail or their iphones to access email. Thus an internal mail server seems like the way to go.

2. I want to update several email distribution address lists such as staff, support staff and all staff. At the moment I am updating the email distribution lists on each outlook client.

3. Access email from any computer within the building. The problem with webmail is that we can only see emails going back five days as outlook is configured to delete emails on pop mail server after five days. We have had to do this to reduce online storage costs. Another problem is that we cannot view sent emails unless we go to the specific computer with outlook installed on it. We would like to be able to view sent emails even if we cannot access the machine with outlook installed where the email was sent from.

4. Outlook is currently not being backed up on each computer that outlook is installed. All other data is saved on server, so would like to have email and addresses also saved on server using IMAP to ensure that the data is backed up. Will it be possible to use a Server backup program to backup the mail server in case the hard drives die?

5. Clients currently use Outlook, but I was considering Thunderbird as transferring Thunderbird between computers is as simple as copying the directory, whereas we always lose something when we migrate Outlook. Also Thunderbird has far fewer settings and is actually easier to support than Outlook in my opinion. Would Thunderbird work with this mail server.

6. Email encryption. Thunderbird for example supports openpgp encryption. Would something like that cause issues with this Mail server program?

7. I am still not clear on exactly what the outlook connector does as I don't really know anything about workplace collaboration or whatever its called. All we want is email client installed on about 5 machines at each client as only about 5 people need a client based email. The rest of the staff will access the internal webmail. We would need to share the following: email distribution lists, public calendar and several group calendars. Only a few select people would actually need to add entries to the calendar. Most staff would be read only on phones or via webmail. Do we actually need outlook connector if we use Outlook to accomplish this.