List of reviewed functions and criteria

Functionality

General
Supported mode of usage
  Desktop Sharing
Virtual room
Localization
  Console in multiple languages
Invitation stage
  Schedule meetings
Schedule recurring meetings
One-click meetings (ad-hoc meetings)
Meeting calendar
During Meetings
Attendee management
  Invite participants after meeting has started
Expel an attendee from the meeting
Application sharing
  Transfer mouse and keyboard control
Access to desktop
Access to selected applications
Clean screen (hide task bar etc.)
Instantly change presenters
Interaction
  Annotation and drawing tools
Whiteboard
Chat
Instant Messaging
Full screen/partial screen mode
File transfer via virtual storage room
Video
  Video-conference supported
Videos adjustable
Highlight video of current speaker
HD video quality
Audio function
  Audio Conference Call Control
Mute participants
Integrated VoIP support
Integrated phone-based conference support
Local toll dial-in numbers
Local toll-free dial-in numbers 
Meeting follow-up
Functionality for organizers
  Surveys / polls
Participant reporting
Meeting recording
Inactivity time-outs
Integration
  Outlook integration
Lotus Notes integration
Integration with other solutions via API

Usability

Usability
  Complexity of the solution (with regard to requirements for training)

Software Installation

Installation effort
  First time implementation

Cost Transparency

Price Model
  Transparency in price model

Security

Meeting-specific security (defined at the invitation stage)
  Low security: Meeting accessible to anyone with the meeting ID
Medium security: Meeting only accessible by means of an additional password
High security: Meeting only accessible to invited participants
Accounts are deactivated after three failed attempts to enter the correct meeting password
System-level security
  128-bit SSL encryption
128-bit AES/ Blowfish encryption
Certified security

Platform Support

Native Clients
  Windows
Mac OS X
Linux
Cross-Platform Clients
  HTML5 Client
Flash Client
Java Client
Smartphone and Tablet Support
  Android support
iOS support
Blackberry support
Windows RT support