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If we have the exchange server, do we still need to purchase Outlook Web App for each user.<br />
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If you underestimate the number of &nbsp;licenses for OWA, &nbsp;what will happend to the user without a license? Will he be able to access the Exchange Server through OWA later once one of the license is available.
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If we have the exchange server, do we still need to purchase Outlook Web App for each user.

If you underestimate the number of  licenses for OWA,  what will happend to the user without a license? Will he be able to access the Exchange Server through OWA later once one of the license is available.

Outlook Web App (OWA) with Exchange server 2010 SP1

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Outlook

An email client, email reader or more formally mail user agent (MUA) is a computer program in the category of groupware environments used to access and manage a user's email. A web application that provides message management, composition, and reception functions may internally act as an email client; as a whole, it is commonly referred to as webmail. Likewise, email client may be referred to a piece of computer hardware or software whose primary or most visible role is to work as an email client. Email clients can also have other systems, like calendars, notes and contact managers.