Is there any way to get the Ms Communicator LCS contacts to a txt file.?

Depending on the version used you can dump the Address Book contents to a text file:
http://blogs.pointbridge.com/Blogs/schertz_jeff/Pages/Post.aspx?_ID=47

Otherwise the user's contact list is stored in the SQL back-end databases, you could probably use a custom SQL query to retrive the data for a specific user.

Or use DBIMPEXP with the /user switch to export their contacts into a flat file.  If OCS, you will find it in the C:\Program Files\Microsoft Office Communications Server 2007\Server\Support directory. If LCS then it will be in the reskit.

Example cmd from Technet:
Dbimpexp.exe /hrxmlfile:"c:\SavedUserData.xml" /user:johna@contoso.com
Link: http://technet.microsoft.com/en-us/library/bb870377.aspx

Thanks what is the command line to import it to OCS 2007?

type dbimpexp /help.

Basically same command, but with the /import switch.  If you want to import it to OCS 2007.. then use the OCS 2007 version to export it and import it.... always use the newest version to export and import.

Thanks
These 2 LCS and OCS are in 2 different forests and not the email address @somename.com is different for a user. When i import it says email address not found. Any views

Names are same just the @domain.com changes.
how can i do this change in xml file?

Can you tried using a text editor you can do a FIND/REPLACE?

The last one I did it was faster for me to change them manually using find then pasting the new domainB.

I did a find and replace and it works perfect. Any ideas on how to do this for bulk users