With the latest version of Office 365 it is possible to alter the password expiry policy for the whole organization directly from the Administration console. To do this complete the following.
Login to the Office 365 console as an administrator. Select service settings on the left hand side.
Select passwords from the options across the top of the page.
You can now enter a value for Days before passwords expire which can be from 14 to 730 and Days before a user is notified that their password will expire which can be from 1 to 30 days.
If you want to set a users password to never expire you will still need to use PowerShell and the details on achieving that can be found here:
Setting a Office 365 users password to never expire
And of course don’t forget to press the Save button after changing any values.