Free offline chat messenger software for windows

Inbit Messenger is secure instant messaging software that will allow your enterprise to reach new levels of collaboration with innovative features beyond the standard enterprise IM package.
With Inbit Messenger, your organization can share files, images, and screenshots to enhance your offices data flow. Inbit Messenger allows users to chat with colleagues and share images of current activity using Inbits screen capture engine, while allowing administrators full control and logging.
Inbit Messenger even provides features to send asynchronous messages and deliver files to offline colleagues.
Main features:
Instant Messaging
? Public messaging
? Workgroup messaging
? Private messaging
Chat Rooms
? Public chat rooms
? Workgroup chat rooms
? Private chat rooms
Internal Mail (i-mail)
? Send i-mail to public
? Send i-mail to workgroups
? Send i-mail to co-workers
? File Sharing
? Public file sharing
? Workgroup file sharing
File Transfer
? Send files and screen shots in offline mode
? Send files and screen shots via online chat
Permission Based Remote Capture
? Capture a remote co-workers screen
? Capture a remote co-workers window
Screen Capture
? Full Screen Capture
? Window Capture
? Region Capture

Enhancements:
- Added project management tools. Manage projects and tasks with schedules, priorities and assignees.
- Added the ability to assign a user to multiple departments.