Strong passwords for office 365 / Essentials 2012R2 - what really are the requirements?

Sorry, I'm a bit confused.  I'm integrating Essentials 2012R2 and office 365.  In the essentials wizard for integration it says it will change the password complexity to strong

This

https://technet.microsoft.com/library/jj713507.aspx

says the passwords must be:  (8-16 characters and must include letters, numbers, and symbols.


This

https://support.office.com/en-ie/article/Change-your-password-in-Office-365-for-business-d1efbaee-63a7-4c08-ab1d-71bf932bbb5d

says office 365 requires:

When you create a new password, your password must have 8-16 characters and combine at least 3 of the following:

Uppercase letters
Lowercase letters
Symbols
Numbers

a) What are the symbols that are good / not allowed (if there are any that are not allowed) and
b) which is it - 3 of the 4 things or all 3 of the first list?

I tried creating a new account on essentials and it seems that it will accept 3 of the 4 (no symbols, just upper AND lower case letters will work.

Thoughts?
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Vasil Michev (MVP)Commented:
O365 by default generates passwords in the format Blah1234, so 8 chars with 3 of the groups should be enough.
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David AtkinTechnical DirectorCommented:
Vasil is correct. You only need to have three of the required four charectors and the password must be greater than eight characters long.

Disallowed characters are:
Unicode characters
spaces
Cannot contain a dot character '.' immediately preceding the '@' symbol

See here for reference:
https://msdn.microsoft.com/en-us/library/azure/jj943764.aspx
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