I have been asked this question by my boss, and I hope that I word this right. We are getting ready to change our email here to "possibly" Exchange for our business. I was wondering if the server offers some kind of cloud benefit for our offsite laptop users. In other words, I am looking for something that will "not" require a VPN connection. We want the email here internally, but it seems that most things are moving to a cloud based system. So, in summary: Purchase an internal mail server, used for all of us here at the business, but have an option to have our salespersons access there email by pointing to cloud based service and NOT through a VPN. I hope this made sense. Feel free to ask me any questions. I am tasked to get some kind of email services for the company up and running., ALSO, but this might be another question "are there suitable substitute mail server technology" that is as popular as MS Exchange. Keep in mind, the boss does not want the brunt of email users to be hosted by anything outside. Just hoping for the outside users, we could host are own cloud of sorts. Thanks so much for taking the time. I would hope that there is, I am new here and you guys can really make me look good.
We have two Exchange servers. One is located in their office, the other is located in a data centre (on a VM with a domain controller in another VM). The two are linked by a site to site VPN. The remote users have their mailbox on the server in the data centre, the office users in the office. It appears as one big Exchange org. We use a cloud based backup solution to backup the data centre server and a NAS drive to backup the office. Works very well and as far as the end users are concerned it is fast.
All email comes in via the data centre and because I am just using a site to site VPN to connect them, if the link goes down I can use anything to get the link back up and the server queues the traffic in the meantime.
The connection from the client to the server is Outlook Anywhere, which is the default connection in Exchange 2013 and runs over port 443 using an SSL certificate.