All user passwords have Expired, can I use the tool to un-expire them easily?

All user passwords have Expired, can I use the tool to un-expire them easily?

We have installed AD Self Service Plus, but not planning to roll it out until June.
 
All passwords in the AD on our hosted system (where the software is installed) have unintentionally expired, and I need a quick way to get that problem sorted - as we have this software installed, I wondered if there was an admin level function which allowed me to un-expire en masse?
 
 

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