We have a hosted Exchange 2007 environment that is hosting Exchange for several clients. We used this guide to setup the environment so that each client is isolated with their own mailbox database, GAL, OAB, etc.: http://www.msexchange.org/articles-tutorials/exchange-server-2007/migration-deployment/shared-hosting-exchange-2007-part1.html
We are looking to upgrade from Exchange 2007 to Exchange 2013. Is there anything that we need to do differently from a standard upgrade seeing as our environment is setup this way? I just want to make sure that when we upgrade it isn't going to revert any of the permissions we have set on the GALs, OABs, etc.