How to increase C drive partition on windows 2003 server?

Option 1
- Would it be possible to use diskpart to shrink the D drive (plenty of space) to create unallocated space and extend the c drive? Can you provide a steps or article to read?
-You cannot use Diskpart to extend system volume. There is a chance that you can connect the drive to different machine as slave but only if your system is located on single HDD. Yours is not. So you cannot use diskpart here.

Option 2
- Create a new array (3 new HDD) and configured as RAID 5. Move the D drive to new array and extend the C drive partition. Can this be done using deskpart?
-Again, no way to do it with diskpart. You need to use third party tools.

Option 3
- Using third party partition software. This is the least option I would go due to financial constraint but I if ever what would be the best software to use?
-To my mind you can do what you want with Paragon Partition Manager 10 Server Edition easily. It is 299$ but it is worth of this price. It includes backup feature too so you could later migrate the system or data partition to new drive easily.
I used it many times and it never let me down. Look the demo here: http://www.paragon-software.com/business/pm-server/
If you want to see it in its work then look attached movie file. I changed the extension to .png and you need to change it back to .exe as you download it. As the extension is changed back simply execute the .exe file and look the way Partition Manager works.

Yes, what is taking up the space as you should have a few Gb free.  
http://www.jam-software.com/freeware/index.shtml will help to locate where the space is being taken up if it not used up but data\installed programs.  If a lot of browsing is done on the server the space may be taken up by temporary internet files in IE.

I inherited the job of maintaining a server a few months ago with this exact situation. I didn't have room on the server to do anything. Here is the process I followed:

1. I uninstalled a few applications that could easily be reinstalled later.
2. Install Backup Exec 12.5.
3. Install a 1TB Western Digital External USB hard drive
4. Activate the Backup Exec Intelegent Disaster Recovery option.
5. Run an entire server backup to the esternal usb drive
6. Under Tools, run the wizard to create an Intelegent Disaster Recovery bootable CD
7. Shut down the server and carefuly replace the HD's with larger ones
8. Boot with the IDR CD and follow the prompts to partition the new drives
9. Follow the IDR prompts to restore each partition
10. Reinstall the applications you uninstalled to free up room.
11. Reboot and prepare to download the Windows and application updates.

Hope this helps,

TG

TG-TIS - seems an expensive solution.  Not sure why no one thinks managing the server differently is even an option...

Yes, was not cheap, but in the long run, it basicly gave our server a new life without the added expense and time to setup a replacement server.

Or did you?  How large was your C: drive?  If you had simply rearranged data, could you have spent maybe an hour or two tops and never had to purchase the software and 1 TB drive?  Maybe you could have used Junctions (as I describe in the article to avoid all that).  Or course, if you were giving your "server a new life" that implies it was old - which then makes me concerned - servers run the business, technologically speaking, don't they?  So if this server fails, it's almost certainly not under warranty... which means getting replacement parts could take days... which means the business could lose SERIOUS money waiting for these parts... money that could FAR EXCEED (depending on the nature of your business) the cost of having purchased a new server.

My point is, people throw out that "you should repartition" and "you should spend money on products that let you extend/expand the server" well after the server is past it's warranty period.  In my opinion, this can be a serious waste of money and put the business at risk.  Properly managing the system is just as valid as spending the money.  I have a client with a server that turns 5 in about 2 months that runs Small Business Server 2003 - 13 GB C: drive.  I've got over 3.5 GB free and I spend MAYBE an hour per year managing it (they bought a spare server off Ebay as a redundant measure since they couldn't afford to extend the service contract or get a new server).  And this is Small Business Server, with all it's standard features installed.  It's silly and, in my opinion, misleading to suggest that the only option that can work is resizing through some method.

I think you should really consider Lee's points.  If money is that much of an issue then a server failure is really going to hit hard.  You should look at replacing the server if it is old.  Also, if you use something to repartition the OS drive and it corrupts, your not going to be very popular at all.

If you've cleaned everything up already i would guess that at some point the server was upgraded from Windows NT.  

The cheapest server Dell provide is for £240.

How many users access this server?

The solutions were provided for sure. The question is - did Binatech use any of them?
My recommendation is accepted 24680395 (noxcho) 250 points and assisted  24679074 (leew) 250 points.
For nowadays servers 10GB is not enough IMHO as you are to take cleaning operations often as space is filled.
15GB would be quite good and the only way to get it increased - resize existing configuration.
      

I believe my comment should be accepted as the sole answer 24679074.

My reasoning is that it was posted many hours prior to noxcho's and contains much the same information, especially when you read my link.