I have now received a lot of questions about Outlook on Windows 7 in conjunction with Exchange 2019. Errors and solutions have always been the same so far, so here's a short article about it.
Outlook (regardless of the version) on Windows 7 cannot connect to Exchange Server 2019. Outlook then displays this message on startup:
The login was canceled because system resources were not available in time. Please try again.
MAPI 1.0 [000004C2]
When trying to set up a new profile, no connection to Exchange is established either, an error message does not appear here:
The cause here is not Outlook but the combination of Windows 7 and Exchange Server 2019. Exchange 2019 only allows TLS 1.2 secure connections. However, TLS 1.2 is not activated by default in Windows 7 and must be activated manually.
Here is an article on how to enable TLS 1.2 on Windows 7 computers:
Windows Update KB3140245 must be installed on the client for TLS 1.2 to be activated. KB3140245 can be installed regularly via Windows Update or downloaded and distributed from the Windows Update catalog:
So that the FixIt tool from Microsoft does not have to be executed on every Windows 7 computer, a group policy can be used instead.
The necessary settings can be found under the following path:
Computer Configuration - Policies - Administrative Templates - Windows Components - Internet Explorer - Internet Control Panel - "Advanced" page
The corresponding setting is called "Disable encryption support". This setting must be switched on and can contain the following combination of protocols:
Use TLS 1.0, TLS 1.1 and TLS 1.2
If you are using different operating system versions, you can restrict the group policy to Windows 7 clients using the WMI filter. The WMI filter for Windows 7 is as follows:
select * from Win32_OperatingSystem where (Version like "6.1%") and ProductType = "1"
TLS 1.2 should therefore be activated before migrating to Exchange 2019. TLS 1.2 is already activated on newer Windows versions.