please can someone tell me the best way for migrating an openemm 5.5.1 from windows32bit system to a SLES11SP2 64bit system?
Of course without losing any data
All data is in the database (except for some basic configuration data in file emm.properties). So, if you backup the content of your database nothing bad will happen. I would suggest doing a dry run based on the info of the OpenEMM install guide.