Office Dictate: Microsoft is testing the use of voice dictation to create PowerPoint documents, notes, emails, and PowerPoint presentations in Windows. THE trial version of the feature was recently made available to Office Insiders.
The official announcement describes Office Dictate as follows.
Dictation uses your voice to create documents, presentations, emails, and take notes in Office applications such as Word, PowerPoint, Outlook, and OneNote. Office dictation uses speech recognition technology to convert speech into text. 
Dictation is one of the smart services of Office, and bringing the power of the cloud to Office applications will help you save time and get better results.
Notes:
This feature is only available if you have an Office 365 subscription. If you are an Office 365 subscriber, make sure you have the latest version of Office. The function is valid for English language.
You must be connected to the internet to use this feature.
Office Dictate is not compatible with HIPAA (Health Insurance Portability and Accountability Act).
How to enable voice dictation in Microsoft Office
You must enable Trust Center privacy options for this feature to work. This assumes that you are running the latest version of Microsoft Office. If you are subscribed to Insiders, you will automatically receive updates with new features.
To enable voice dictation in Microsoft Office:
Open Microsoft Word.
Click File - Options - Trust Center - Trust Center Settings - Privacy Options.
On the right, activate the check boxes.
Note: Your phrases will be sent to Microsoft and may be used to improve speech recognition services.
You're done.
How to type with your voice
Open an Office application.
Turn on your microphone and make sure it works.
Select Dictate, and wait for the Dictate icon to turn red. You can then start talking and the text will appear in your selected document, email, slide or page.
Note: In case of an error, you can move the cursor to the error and correct it with your keyboard without turning off the microphone.
The following phrases are to add punctuation to your text:
- Period
- Comma
- Question mark
- New line
- New paragraph
- Semi-colon
- Colon
When done, tap the Office Dictate icon again to stop.
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