How do I completely remove Office Communicator 2007 and get Communicator 2005 working again?

Which server am I running this on, the LC2005, or OC2007, and what does it do?

Thank you for the quick feedback.

This script will uninstall OC 2007 ... if that didn't work try running OC2007 setup and then Uninstall it..
if either didn't work, you may have to stop the OC services to get it removed.

All components of OC 2007 have been removed using Add/Remove programs, so running that command doesn't seem to do anything that I can tell, unless the /q is a quiet mode or something.  Also, there are no services listed for OC 2007 that I can stop.  

I'm thinking there's some piece left behind in AD that's causing the problem.

One more thing.  If I try to reinstall OCS 2007 on the second server, I get "failed to open existing office communications server database" just like the guy in this other thread.

http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/MS_Live_Communications_Server/Q_23864396.html

At this point I can't get LSC 2005 to run and OCS 2007 won't install.  Ideas?

Thanks for the input.

Now I've gone as far as removing LSC 2005 and unprep'ing the forest/domain, removing the service accounts and then reinstalling everything.  After the going through the install proceedure (forest prep, domain prep, software install, activation) the Live Communication Server service will not start and give the following error.

"Could not start the Live Communications Server service on Local Computer.

Error 1069: The service did not start due to a logon failure."

As I mentioned, I removed the service account when I uninstalled LCS, so a new one was created during the installation.  I've checked the LCService account and it is a member of the RTCHSDomainServices group.  I've also verified that the RTCHSDomainServices group is a member of the RTC Server Local Group Properties.

If I change the Log On as account for the Live Communications Server service to use the Local System account, it will start, but then stops about a minute later and gives the following errors in the App log.

Event Type:      Error
Event Source:      Live Communications Server
Event Category:      (1000)
Event ID:      16426
Date:            4/2/2009
Time:            8:39:49 AM
User:            N/A
Computer:      SERVER-SPS1
Description:
Failed starting a worker process.

Unable to start a process for 'D:\Program Files\Microsoft LC 2005\Server\RTCSPL.EXE', error code is:0xc3ed403a (The worker process failed to initialize itself in the maximum allowable time.).
Cause: This could happen due to low resource conditions or insufficient privileges.
Resolution:
Try restarting the server. If the problem persists contact product support.

Event Type:      Error
Event Source:      Live Communications Applications Module
Event Category:      (1010)
Event ID:      30217
Date:            4/2/2009
Time:            8:39:49 AM
User:            N/A
Computer:      SERVER-SPS1
Description:
Failed to launch Live Communications Script-Only Applications Service process.

Cause: Either the RTCSPL.EXE file is missing or it tried to start and failed.  If the latter there should be event log entries before this one

Event Type:      Error
Event Source:      Live Communications Server
Event Category:      (1000)
Event ID:      16395
Date:            4/2/2009
Time:            8:39:49 AM
User:            N/A
Computer:      SERVER-SPS1
Description:
The component Live Communications Applications Module could not be started. Error code is 0xc3ed403a (The worker process failed to initialize itself in the maximum allowable time.). The service has to stop.

Event Type:      Error
Event Source:      Live Communications Server
Event Category:      (1000)
Event ID:      12299
Date:            4/2/2009
Time:            8:39:49 AM
User:            N/A
Computer:      SERVER-SPS1
Description:
The service is shutting down due to an internal error.

Error Code: 0xC3ED403A.
Resolution:
Check the previous event log entries and resolve them. Restart the server. If the problem persists contact product support.

If I could figure out what's wrong with the account, that may be it.

Have you tried resetting the LCService account password in Active Directory and changing the Live Communications service account password to match?

Yes I have, and that does not work.  I've also tried creating a new account which doesn't work either.

I think I may have figured out the problem, it has to do with the installation sequence.  Here's the process I went through which seems to have worked.

- Install the Live Communication Server 2005 software from CD.  
- After successfully installing the software and activating the server, do NOT attempt to start the LCS Service
- Install LCS SP1, then reboot
- When the server restarts the LCS service should successfully start.  This was not working previously for me.

Now I'm able to enable live communications for each user.  The only problem I  have now is when I click on View/Edit button in a users Live Communications properties, I get the error "Failed to read the Allow and Block List data."

Anyone know how to correct that?
Thanks for the input.

LCS2005 has been up and running for about a week now even though I'm still not able to resolve the problem where I get the following error when opening each users AD Live Communications tab and click on the View/Edit button.

"Failed to read the Allow and Block List data."

This button is normally used to set a list of users who are automatically approved, rather than one person adding a contact and having the second person get a pop up asking to approve the first person.  Normally I would go in and set each users LC properties to approve all automatically since we're a fairly small company and there's no real reason to block anyone.  Unfortunately with the above error I cannot open these properties.

Can anyone give me an idea of what's wrong here?
Thanks.

I'm really learning to hate LCS 2005.  After six months of trouble free operation, Tuesday the train went off the tracks when LCS quit working saying that it was a trial version that had expired.  I installed it from our volume licensed copy, but somehow MS thinks it's a trial version.

The warning message I received stated that LCS needed to be uninstalled and reloaded from licensed media, which I attempted to do.  Now I'm pretty much where I started with this issue but with a new twist.  After deactivating the server and uninstalling, when I reinstall I get "Error 27772. The existing Live Communications Server database is not available for use. "

I've done a good bit of searching and found mention of using dbimpexp.exe to drop the database, but I can't find this file on the server, media, or anywhere on the net.  Where can I get this file?  Or if there's another way to get rid of the existing database, I'd love to hear about it.

Thanks for the assistance.

Use DBIMPEXP.EXE to try and dump a copy of the users contact information from the database.

Sounds like you have Standard Edition LCS so Uninstall the MSDE (Microsoft SQL Desktop Engine).  Delete the LCS Data and LCS Logs folders.

Reinstall LCS.

Used DBIMPEXP.exe to reimport users contact information after you re-enable them for LCS or move them from the unassigned users node in the LCS MMC if they happen to be oprhaned.