As is said in the beta thread (but it was ignored) the AIS MS has a problem. The content of my incoming mails is replaced by “???” or “ℼ佄呃偙⁅呈䱍倠䉕䥌⁃ⴢ⼯㍗⽃䐯䑔䠠䵔⁌⸳⼲䔯≎ാ㰊呈䱍ാ㰊䕈䑁ാ㰊䕍䅔丠䵁㵅䜢湥牥瑡牯” instead of html. (seems that not all mails are affected but the most of them)
i have to turn off mail security and lost some mails because of this bug. downgrade to 6 ais will fix this problem.