@hurdk, thank you!
@thiel2,
The Avaya IP Office version we are running is Version 9.1.12.0 build 213
The "editions" question, I don't know how to answer.
I opened IP Office, yet I can't find anywhere the "edition" (Partner, Basic, Essential, Preferred, or Server).
Where could I find that information?
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For the extensions Print button, I open up IP Office, then I go File --> Advanced --> System Status
I log in to the System Status program.
Once logged in, on the left-side tree, I click on "Extensions".
That brings up a big table with Extension Number, User extension, Name, IP Address, MAC, etc.
I attach a screenshot.
I'm going to try your File -- Export process now.