I stumbled upon Microsoft Office's feature of file encryption. For storing sensitive data in the cloud, e.g. DropBox, this sounds like a nice feature. Reading that the encryption is AES-128 in CBC mode by default, it seems to provide a decent level of confidentiality, even though are still some open details.
Of course usual symmetric encryption does not provide integrity, but as I know Microsoft I wouldn't be too surprised to learn that they actually also meant some kind of integrity protection by naming it encryption. However, this lead me to the following question I wasn't able to find an answer to.
Does the encryption of Microsoft Office guarantee integrity of the saved data?
PS: I already read this question, but it is only concerned with confidentiality.