FWIW: My Office 2011 apps themselves did not get an update yesterday, but the AutoUpdate piece did. It is now version 3.17.18031100 (21 Mar 18).

Perhaps that's what happened...

Harv
27" i7 iMac (10.13.6), iPhone Xs Max (12.1)

Those who can make you believe absurdities can make you commit atrocities. ~Voltaire