Re: So, what are FOSS e-mail client /server options?
Did a US judge not recently rule that MS locating servers in Europe would not protect them from data-mining by US officials without needing a court warrant? This provides difficulties using US owned cloud services for organizations that want to comply with data protection laws, or just wanting some privacy.
There also seems to be a problem with data availability for Office 365 users. See frequent El Reg reports, including another one today.