QCS service account password was changed and now QCS Synchronization service is unable to start (4218471)

If QCS service account password was changed without following the proper procedure, its service may fail to start with the following error:

"The Quest Collaboration Services Synchronization Service service on Local Computer started and stopped. Some services stop automatically if they have no work to do, for example, the Performance Logs and alerts service"

Please change QCS service account password in AD back to its original value and then follow the proper procedure:

Note: If the Synchronization Service is unable to start, you must first set the password back to its original value in Active Directory before proceeding. You will be changing the account password on Step 6 (below). 

1. Open the QCS console
2. Right click the top Collaboration Services node and select Properties
3. Select General | AD Options
4. Enter the new password for the service account
5. Ignore the error: "8004860B(4023DD7):Unable to perform permissions test. Error code:0x80040431 Details: 80040431(5C2E796):Invalid credentials." and say YES to Apply changes dialog
6. Change the password for the QCS service account in Active Directory
7. Stop QCS Synchronization service (while stopping it will hang which is expected behavior, please End ACSMAPIServ.exe process via Task Manager)
8. Update the  password on the QCS Synchronization service via Properties | Log On Tab in Services applet
9. Start the service again
10. On the QCS console right click and select Reconnect

At this point QCS installation should be fully functional.