Free remote server administration software for windows

Microsoft Remote Server Administration Tools (RSAT) enables IT administrators to remotely manage roles and features in Windows Server 2008 from a computer running Windows Vista with SP1.
It includes support for remote management of computers running either a Server Core installation or the full installation option of Windows Server 2008. It provides similar functionality to Windows Server 2003 Administration Tools Pack.
System requirements:
- Service Pack 1 (SP1) is required.

The Microsoft Exchange Server ActiveSync Web Administration tool enables administrators to manage the process of remotely erasing lost, stolen, or otherwise compromised mobile devices.
By using the Exchange Server ActiveSync Web Administration tool, administrators can perform the following actions:
- View a list of all devices that are being used by any enterprise user
- Select/De-select devices to be remotely erased
- View the status of pending remote erase requests for each device
- View a transaction log that indicates which administrators have issued remote erase commands, in addition to the devices those commands pertained to
The Microsoft Exchange Server ActiveSync Web Administration Tool is designed for use with Exchange Server 2003 Service Pack 2 and Exchange Server 2007 RTM and SP1 and compatible mobile devices.
System requirements:
- The Microsoft Exchange Server ActiveSync Web Administration Tool must be installed on an Exchange Server running Internet Information Server 6. The Exchange Server must be part of the domain to be administered.

Remote Assistance Identification 1.07 is a software that tries to connect itself to a remote server using the HTTP protocol.
Due to high number of clients we have, and need to maintain high quality of our support service we decided to use some kind of Remote Desktop. We choose VNC remote administration tools. Althrough VNC is good solution, we noticed problem from the very beginning: it lacks easy management fo remote users which are not available on static public IPs.
We constantly had a problem to find out when user, who requested assistance, is online, and what is his IP we can use to access his computer. Usualy, we had to keep user online on phone line, and make him connect via other line and then tell us whether he is connected and what is his IP.
We found out solution in writing quite small and simple app to help finding this information fast, reliable, and without involving our clients more that necessity to connect to the internet. That aplication is Remote Assistance Information. We call it RAI, for short.
It works quite simple: it stays in systray and tries to connect to remote server using HTTP protocol. If there is internet connection, it will provide information about user online status and his ID. Our support staff can check the status by simply visiting our site. They can see which users are online, and what IP address (or addresses) they use. Then, connection with the VNC client is easy.
Security
We already spoke about security. This app deals with information about clients that should be treated as private and kept confidential. It would not be vise to allow anybody to see which of your clients are online, what are their computer names, which IPs they currently use, which operating systems and possibly even more information which you provide in notes. Make sure that this information is kept private.