Hi, I have an older MBA with 128G SSD. As you all know this isn't much space and it fills up very quickly. I have a lot of work related applications and files. I dislike the idea to have to carry an external USB drive with me where ever I go. Kinda defeat the purpose of having a MBA don't you think? To free up space, I am wondering if it's a good idea to delete some or all of these useless applications that bundled with OSX such as iTunes, Mail, Calendar... since I have no use and never use any of them. If I remove them will it cause any problems for the OS itself?