I have been using Apple Mail for some time now, and I have all of my mail on mailboxes "On My Mac." I use this because I want/need to able to access my mail without an internet connection at any time from my question. However, I would also very much like to be able to access these mailboxes from my iPhone or other devices. If I were to move all of my Apple Mail On My Mac mailboxes to iCloud mailboxes, would I still be able to access my mail offline whenever I wanted (and I would only need the internet to sync), or is there a better solution to my issue? Does switching from OMM to iCloud limit or lose any features? Thank you for the help.