The main disadvantage IMHO is that Microsoft's email systems are absolutely horrible at determining what is junk and what is not. With our business account I have to check the junk folder nearly every day to find legitimate emails coming from longtime correspondents that are in my address book and are not junk. I can mark them as not junk every time this happens and it doesn't matter, occasionally they end up back in junk. On the other hand, numerous actually malicious emails sail right through their filters and end up in my Inbox!
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