To whom it may concern: I have joomla 2.5 and I am going to upgrade to 3.7.2 with its proper upgrade package. There are subdomains in the root of main website which I want to upgrade, I believe if upgrade fails, there will be no effect on subdomains and their folders in the root of main website. Am I right or wrong? P.S Subdomains are upgraded and backed up already too. Kian William
Normally this should not be a problem. Usually subdomains are located in their own folder and updating the main domain's Joomla installation should not affect the subdomains.