Question : Free up drive space for my server's OS

We are running Windows SBS 2003 on our server.  The main hard drive is a hardware configured mirror.  It is comprised of C:\ being 25 GB for the operating system and D:\ being 207 GB which originally had the data.  The data has now been moved off of D:\ onto a new physical drive.  C:\ is nearly full.  It would be nice if I could let C:\ extend into what is now D:\ but I understand that that is a major task.  So I have been moving various utilities, log files, etc. onto D:\ to try to relieve C:\.  Other people have had this issue and I've read some of what others are doing.  Here are some suggestions I've seen:
1. Redirect users profile folders elsewhere.   I think I can find out how to do that.
2. Move the pagefile......  I've already done that.
3. Move SQL log files and databases.   I have no idea how to do that.
4. Install large applications onto another drive.  This sounds tedious.
5. Move Program Files folder to another drive.  This sounds too easy and might cause issues.

Anyway, what would you suggest?

Answer : Free up drive space for my server's OS

hermhart, yes, your guess will work also. You can reduce the size of D: and allocate the space to C: without a problem.
Now you need to convert the drive to basic first. And Partition Manager 10 does this safely without deleting the volumes on dynamic drive. How it works:
1)Install Partition Manager
2)run it and right click on HDD (not mirrored)
3)Select convert to Basic. It will ask for reboot - agree. During restart the drive is changed to Basic type.
4)In Windows start PM - right click on D: - Move\Resize - catch the left border of partition and drag it to right. Free as much space as you need for C: and apply changes. If you have files running on D: this could request additional restart. Apply it.
5)Then when resize is done - right click on C: - drag and move the end of C: to right. Allocate space and apply changes. This will take few seconds. Done.
Another way to perform this without reboots is using WinPE Recovery CD for Partition Manager 10 that will do Conversion - resize.
And finally if you connect additional drive - move all from D: to it and delete D: - then convert dynamic to basic and increase C: - this would be also fast.