Hotmail problem since upgrade from Gingerbread to ICS

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http://androidforums.com – I have a Sony Ericsson Xperia Neo which I upgraded end of june 2012 from Gingerbread to ICS. Since this upgrade my mails are no longer shown under my hotmail app "Seven", nor my hotmail calander is synchronising. I have the same problem if I want to define another hotmail address from one of the family members on my Sony Ericsson Xperia Neo, running Android ICS. So, all hotmail e-mail addresses do not work under ICS. On the contrary, what does work is my hotmail e-mail address on the Sony Ericsson Mini of my son, which is still running Gingerbread. Also on the Samsung Galaxy Sta ()