Migration for IBM TDS 6.0 to 6.1 or 6.2

Probably "less maintenance" if you switch over to Microsoft ADAM/ADLDS since you are already on Windows Platform. Last I checked, there is no decommission date for ADAM/ADLDS. One less piece of Lawson to worry about.

Are you using ADAM right now?

ADAM is a little lighter weight and less maintenance (i.e. no DB2). I have migrated TDS to ADAM for some clients. It's do-able but a lot of work. =

Is there any good documentation for migrating TDS from 6.0 to 6.1 or 6.2?

There are many documents on IBM's Website regarding this topic, I also advise ADAM as mentioned above. There is a migration path, Contact me at huneidicc@yahoo.com

Since you are on Windows, I would recommend you switch to ADLDS (formerly known as ADAM) also.

As for migration path, there is no work needed:
do the following:

TDS (older) -> TDS (newer)
1) Backup your instance owner's home directory
2) Dump your instance data
*** You can use 'ldapsearch' or Lawson tools
2) Install fresh software and instance
3) Restore your ~/etc/V3_modifiedschema.ldif file
4) Reload your instance data

...now for TDS -> ADLDS it's a bit harder. The basic flow is as follows:
0) Dump existing LDAP instance
*** MUST USE LAWOSN TOOLS
1) Install ADAM instance
2) Use ssoconfig to repoint environment
3) Modify the config files to change LDAPType to ADLDS
4) Rebuild Schema object file
5) Load file from #4
6) Load files from #0

...that's it.

TDS->TDS should take about a day for the inexperienced.
TDS->ADLDS might take about a week for the inexperienced.