IMO a migration from Ensim to ISPConfig is a rather huge task ...
There are a lot of obstacles to overcome:
- If you only have the Ensim backups of the sites you might have problems
untarring them due to the digital signature at the end of the files which
gzip labels as "trailing garbage".
- Ensim sites in "High Security" mode might have their own set of certain
config files (such as php.ini)
- Ensim sites in "High Security" mode might have additional software
installed in their filesystem template that could be referenced/used
somewhere in their website
- You'd have to go hunting for mysql/admin/email-accounts and their
corresponding passwords/hashes to recreate all accounts on ISPConfig
there are probably a lot more things to look after than that, but the
question is: how many sites do you want to migrate and ist that worth
the trouble? (And I don't mean switching the control panel