Hi Desiree,
I am sorry for the later reply. As you mentioned above, I’d like to confirm the situation you met. Did you mean that after you let the Office 2010 professional plus licenses expired the entire, you got a warning message said the entire tenant would be disabled?
In regards to IIS reset, as you might aware that Office 365 is a cloud based service. There are multiple tenants hosting on an IIS server. The IIS resetting might cause huge unexpected lose. Thanks for your understanding.
Thanks,
Kent Gu