Hi.

Does anyone here have a suggestion for a cross-platform IM solution wich will work with voip/video on both Windows (XP and 7) and Mac OS X from 10.4 and upwards?

Right now were in a kind of mixed enviroment, with some Mac users using iChat server since they need video support (conference across several offices over VPN), but it wont't work on windows clients. The rest of us are happily using Openfire+Spark, but there's no VoIP or video avaible from what i've found, unless you want to add in several 3rd party software (like red5 and asterisk).

Requirements:

• As said before; must work on both Windows and Mac
• Internal server (no Skype etc)
• File transfer between platforms
• SSO (Single Sign-On) via Active Directory authentication
• Some sort of screen sharing would be a plus, like switching over to a screen capture (powerpoint, software training etc)

We can afford to buy software if that's needed to get this working without any hiccups across platforms.

Pre-thanks to anyone who gives suggestions.