The password for your Skype for Business account is your app password that should be saved on your X drive

Some times users will get a message that no default mail application is selected.  In Registry Editor, locate and right-click the following subkey in the registry, and then click Permissions: HKEY_CLASSES_ROOT\Installer\Components\F1291BD604B860441AB89E60BDEE0F9C Under Group or user names, find your own user name or a group that you're a member of (such as Users or Administrators). Add the user and give Full permissons.