Microsoft Office can be installed as a trial version and can be activated later depending on the necessity and likeliness to use it. For this purpose Microsoft Corporation has introduced the trial version and that can be used for a period of 60 days and later on if we like the product we can continue using it by purchasing the key for the full functional program. Not only Microsoft but each and every branded company requests for an activation of their products to verify that we have purchased a genuine branded product of that particular company.