Requirement Set is updated to 1.3, not 1.

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. The solution this time, however, was not at all obvious.

These sorts of symptoms are actually not all that uncommon, and a range of different solutions exist to rectify them.

We're developing and Outlook web add-in that needs requirement set 1.4, which is supported by both Outlook 2016 CTR and MSI. Each time the client clicked the shortcut to open Outlook, the splash screen opened and Outlook would hang on the Loading Profile screen.

Upgrade to outlook 2016 cannot log on