Support provided a Migration Tool which was simple to use. The main time consuming bit was me manually going through the text file produced, to determine why there were duplicates (usually because we had, in the past, deleted a VM and recreated a new VM with the same name) and other bits and pieces that the migration tool was not happy about. Running the migration tool was otherwise straightforward (once I had found the English instructions to replace the Russian ones which come with the tool!
). Backup jobs were simple to tweak and got them running easily. Replication jobs took a little more manual work remapping each VM, but these too are now working fine (apart from the very time consuming 'Calculating Digest for HD . . '. Strangely one VM has a 150GB HD which has taken about an hour, and another has a 100GB HD which took 4 minutes? The latter had failed back to network mode, rather than HotAdd. Should I investigate this further? I don't need to as I'm not planning to move to another VCenter server for some time!!)
Good service from Support. (Case 01767739)