In addition to the predictability of the deployment costs in both time and resources, Exchange Online from Office 365 offers the ability to easily adjust the number of licenses for people using the software. A hiring manager might plan to hire 45 people but find out later in the year that they need to hire another 30 as the company grows more rapidly than expected.
It is easy to provision new users for Office 365 through the simple administrative interface.
Another benefit of SAAS software is that chief financial officer-types can find out exactly what the costs will be now and in the future. The CTO doesn’t need to explain why the project was eight times over budget or why four more people were required for the IT team to support the new software. The price in resources, people, and time is very transparent and obvious from the beginning.
In other words, the costs are very predictable, which is what accounting people and executives like to see.
Although it may seem blatantly obvious that software should be available all the time, you may be surprised by how many enterprise systems are only available during certain business hours. Exchange Online is available all day, every day, without interruption. In fact, Microsoft guarantees a 99.9 percent uptime.
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Source:http://www.dummies.com/how-to/content/flexible-provisioning-with-exchange-online-from-of.html
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