I had the exact same problem with outlook 2010 - Xfinity blamed microsoft and microsoft blamed Xfinity. Bottom line was microsoft no longer supports outlook 2010 so I had to upgrande to 2017. NOW I have issues with xfinity incoming emails getting hung up on synchronizing...I eventually get them but it can be a full 24 hours. And it happens whether I'n n Outlook or on the xfinity app. If I didn't have a phone (Sprint) I would not see important emails. No answer according to everything I've read here!
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