1001, which is different from machine A.
Outlook > File > Office Account > About Outlook still shows:. We then tried to download and install the latest update for Outlook from this site, but the result is not as expected: We figured out that Outlook on A is the latest version but Outlook on B is not, so we tried to trigger Windows update on B manually, but it cannot find any update for Outlook. When we tested the add-in on both machine, it's loaded into Outlook of A, but not B. Machine B has just had Outlook installed today without any update. Machine A has Outlook installed long ago and it has windows auto update turned on. We have Outlook 2016 MSI 64-bit installed on 2 different machines.
We're developing and Outlook web add-in that needs requirement set 1.4, which is supported by both Outlook 2016 CTR and MSI.