No, this is not possible with Office 365. The solution to this problem is to have an internal user send an encrypted email message to the external recipient. If the external user replies, the message will then be encrypted. The State made security a major priority during the negotiations with Microsoft for Office 365.
There are few published studies regarding the epidemiology of PTBI in SA. This study forms part of a larger prospective observational study of PTBI. PTBI is a global public health problem of major significance, and is associated with high mortality in children and adolescents.
PTB is an acronym for Power Tab File. Files that contain the .ptb file extension most commonly store music tablatures that are used in the creation of sheet music for stringed instruments such as the bass and guitar. Many of the tablature files that contain the .ptb file suffix are created with the Power Tab Editor tablature authoring software. The Peachtree Corporate Accounting software is also known to use the .ptb file suffix. When a PTB file is associated with the Peachtree software, the file contains backup data files that are used by the application to restore lost or corrupt data.