Vienna comes loaded with a number of features that make it easy to use but still powerful.

Uncluttered UI Simple, uncluttered UI
Vienna's user interface is intentionally kept sparse so as to present you with only the controls you absolutely need. All other functionality is moved to the menus.
RSS and Atom feeds Support for RSS and Atom feeds
Vienna supports both RSS 2.0 and Atom feeds. It automatically takes care of deciphering and presenting the articles in a consistent format regardless of the original feed format.
Browser tabs Built-in Browser
Vienna provides a built-in web browser based on the Safari web engine. Clicking an external link in an article provides the option to open it in Vienna for convenience.
Search articles Global Search
Quickly and easily search for a word or phrase across all downloaded articles and group the results together into their own folder for easy reading.
Smart folders Smart Folders
Create folders whose contents are dynamically determined by criteria that you specify. When you view the folder, Vienna automatically displays all articles meeting that criteria.
Integrated enclosures Integrated Enclosures
For news articles that contains files, Vienna automatically recognises them and offers to launch them. Play your music enclosures in iTunes.
Grouped folders Folder groups
Organise your subscriptions into groups and you can even create groups within groups.
Export and import Import and Export
Import your subscriptions from Bloglines or any other RSS reader that exports in OPML format. Similarly export your subscriptions to an OPML format file for importing elsewhere.
Scheduled Refresh Scheduled Refresh
Refresh your subscriptions automatically every 30 minutes or every 1, 2 or 6 hours.
Flagged articles Flagged Articles
Flag articles of interest and view them together via the Marked Articles smart folder.
Reading panes Reading Panes
Choose your reading pane layout. Put it below the articles or to the right, whichever orientation works best for you.
Styles Styles
Change your style in which articles are presented from any of the built-in custom styles. Or create your own styles with a bit of knowledge of HTML and CSS.
Article Filtering Article Filtering
Filter the displayed articles by all articles, unread articles, articles retrieved today or only those articles retrieved since the last refresh. A popup menu on the article list header makes it easy to switch between all four filter modes.
Article Filtering Blogging Integration
Quickly blog the selected article. Vienna automatically recognises the most common blogging software and launches the software with the details of the selected article pre-filled.
New Get Info Window New Get Info Window
The new Get Info command on the File menu brings up a Info window that provides one stop display of a feed's link, description, count of articles and options for editing the authentication info for protected feeds. (The Validate Feed command has been moved from the File menu to the Info window.)

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