In English windows 10 OS with Skype 2016, some Japanese font happens to turn to whitebox like hieroglyphics strings.
Skype 2016 seems to refer the fonts in windows OS even if you choose the default fonts in Setting in Skype for business. It happens when your computer does not have Japanese fonts of which the sender use on Skype.
There are three ways for this solutions.
You are required to install Japanese supplemental fonts.
Before you install it, Japanese language pack and basic
According to Microsoft, you can install the essential fonts for this issue if your Computer is allowed to apply the font via Microsoft directly. If the machine is a company own, it might not be able to do this because of their security or something IT policies. In this case, please go Solution 2.
Any of these optional font packages can also be installed manually by any user in Settings. One package is not
triggered automatically but can be added by enabling it in Settings. To add font packages manually, go to Settings > System > Installed apps > Manage optional features.
Script and Font Support in Windows
Contact your IT team and ask whether they could install Japanese fonts, and supplemental fonts etc.
If you just want to see japanese text on Skype shortly, changing the default font on Skype for business would be the best workaround. Please refer to Solution 3.
STEP1) Download Japanese Supplemental Font and related language files from Microsoft, and save them in local disk. ( e.g. c:\temp)
STEP2) Run Command prompt as Administrator
STEP3) Type the following command to install JP fonts.
Basic> dism /online /add-package /packagepath:c:\temp\Microsoft-Windows-LanguageFeatures-Basic-ja-jp-Package.cab
Fonts> dism /online /add-package /packagepath:c:\temp\Microsoft-Windows-LanguageFeatures-Fonts-Jpan-Package.cab
STEP4) Check JP font install by the following command.
dism /online /get-capabilities
You will see "CapabilityName:Language.Fonts.Jpan~~~und-JPAN~0.0.1.0" if the supplimenta font pack installed on it.
Language pack : lp.cab
If you are urgent to read Japanese text on IM, try if Skype for business displays Japanese fonts which your computer already have. MS gohic or MS Mincho is one of the options I think.
To check the fonts in your computer,
Start | Type "Control Panel" then open "Fonts" (View by : Small icons)
Reference for English speakerOn non JP windows10 OS, some applications might not display Japanese properly.