We added a new feature in Zoho Viewer last week which allows users to set an expiry time on the documents uploaded in Zoho Viewer. After the specified time, the document will automatically be deleted from our servers and the link to the document will cease to work. You can also set the document not to expire at all. Refer the image below on the choices available.
The expiry information is available via the Info link in the document page.
Other updates in the last few months include:
1) Japanese version of Zoho Viewer. If you access Zoho Viewer with your browser's locale set as Japanese, then you will see the Japanese version. It was launched in December.
2) A new Slideshow link for ppt/pps/odp/sxi files, which enables you to run a slideshow in full screen mode.
Here is our introductory blog post on the Zoho Viewer. Do try out Zoho Viewer and let us know your feedback.