Is there a way to validate O365 users credentials through powershell? I have read online that it's possible to do so on Active Directory with come scripting. I have a CSV file with users and passwords which I would like to work off.

Some background on my scenario... I have a site with over 100 users on Office 365. I am now implementing Active Directory at the site. I setup all the users in AD matching the usernames in Office 365 with the list of passwords that I had on record (yes i know..). Since DirSync only works one way from AD to Office 365, I would like to make sure all the passwords match before going live so there is minimal disruption for the users.

Thank you.

LjAC

You cannot get the actual password from O365 to compare them. What you can do is authenticate with the one you have on record and check for any errors during the login process.