Octel Access Server Password Change

Can someone help out on this...

We have an Octel 350 with the latest Arial software with Visual Messenger application running on an Octel Access Server (OAS 4.0)..... all is working fine

We are actually running the OAS software on a Win 2003 server box... I know only Win 200 OS is supported, but we needed to get it moved to a supported OS.. the IT guys made it work.

Here is the current issue:
There is an local machine user account called "Octel"
It appears that our IT folks have run a report that shows the password on this account has not be changed in like 2,500 days.... and it needs to change.

There appears to be three services that run on the server that are OAS related..
OCAPI Gateway
Octel Access Server
Octel Designer
These use the Octel account to start the services.

My question is...

If I change the password of the "Octel" local account in Computer Management....
Where do I need to update the password on the OAS side?
Do I use the "Properties" / "Log On" tab for each service to update the password

OR

Do I use the Octel Access Admin software... Utilities/Change Password function

Thanks