When adding something in the Notes section of an Appointment, Meeting, Contact or Task item, I noticed that the Format Text tab is completely greyed out and also most of the Insert tab.

I always used to be able to add Rich Text to this field and add pictures and other attachments to it but now it no longer seems possible. The Attach File button actually does seem to work but I can’t access the files anymore after attaching.

What is causing this and how can I re-active it all again?