Forum Discussion
iCloud for Outlook Incorrect Username or Password
DaveR42 I'm using Outlook 2019 that is 64 bits already. Before I was using the same Outlook 2019 with Windows 10 and was working properly. The problem with the authentication was after upgrade to Windows 11.
I have done a lot of tentatives but with no sucess. A called to Apple support and they told I should call to Microsoft support. I tried to call to Microsoft support but the are nos offering support by phone (very disappointed....)
Stuar1620 I have another PC with Windows 10 that is still working fine. My main PC, which had Windows 11, was experiencing this problem.. On the Windows 11 PC, I wiped the 32-bit version of Outlook and iCloud, then installed the 64-bit version of Outlook. This solved the problem, although I still have no idea why this resolved the issue.
- Office 32-bit and Ofice 64-bit are compatible at the file-format level, but they have subtle differences with how they call .dll libraries. My guess is that Apple has tested and optimized for the 64-bit version, either because their own applications are 64-bit, or because they think (know?) that the bulk of new installations are 64-bit.
That said, Office isn't changing much over time at this point, with the 2016, 2019, 2021, and 365 versions using the same registry settings and general architecture, so breaking Outlook with a new iTunes release in 32-bits, while having it work in 64-bits, is odd.- I agree it is odd. The iCloud plug-in file is located at C:\ProgramData\Apple Inc\iCloud\Outlook\APLZOD6432.dll, which is supposed to work with both Office 64-bit and 32-bit versions. Maybe someone can try to get an older version of this file to replace the new version and check if this can resolve the issue without crashing the iCloud
In this case, if somebody finds this old version of APLZOD6432.dll that works, please post a link for it here.
