Which is best?
Sometime we recommend Exchange, sometimes we recommend Office 365 or Exchange Online. It is best to discuss with us your requirements and then we can advise you of the most appropriate solution for you.
The advantage of an on-premises Exchange, is that you are in possession of all your emails on site at your office or home business. You have full control over the data and can be assured that any backups you create are visible to you and safe from attack.
Office 365 or Exchange Online does have its own advantages over its on-premises counterpart. The first one is that this service will work virtually anywhere in the world and would not be dependant on the internet connection being operational wherever the on-premises Exchange server is located.
Both systems offer similar functionality in terms of synchronisation and shared components such as Calendars, Tasks and Contacts.