Microsoft Exchange is the standard for business class email, because as well e-mail, it also comes with a range of tools to help increase productivity. These include Calendars, Meeting Requests and Tasks.
Traditionally Exchange Server would be hosted on server infrastructure, on a local network. Now thanks to Microsoft Office 365 this technology can be supplied on a per user, per month basis. This helps cut down on the initial significant capital expenditure that traditionally came with deploying Exchange Server, thus helping to cut down on ongoing upgrade costs, as versions become end of life. This enables businesses to work from a stable, financially backed platform that future proofs your business.
Your Office 365 estate can grow as your business grows, so you only spend funds on the resource that is required at any one time.