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You will notice the Lync Web App is not only very similar looking to the client, but will also see that it performs nearly all of the functionality that is provided by the desktop Lync client. The only thing visibly not available to use is the VoIP facility, so one would need to dial in to the service, or have Lync call out to you.
If the Lync dial-in settings are set by the Office 365 administrator in the web client console, then it is easy to get the Lync Web App to call you back directly on your home or office number.
A vast quantity of features exist within the Lync Web App, such as the whiteboard and as seen here, the poll function. The Lync Web App is entirely Silverlight based, so the functionality is not only rich and user aesthetically pleasing, but it is scalable and expandable and available on a vast number of platforms - even non-Windows.