They also used public standards and added propietary incompatible standards on it. outlook 365 requires changes to use smtp and imap that are not always compati

They also used public standards and added propietary incompatible standards on it. outlook 365 requires changes to use smtp and imap that are not always compatibel with standard software. They "standartised" their xml based document standard (docx, ...) despite the open document standard already beeing standartised and impossible to implement for other developers except microsoft(modern office files are incompatible with the standard).