I had a PC that wouldn't support Windows 11 and found that a Bios setting change in security was all that was needed. TPM was installed but was not turned on.
Find your .pst data files and copy them to a flash drive. You can add the data files on the new PC using Control Panel/Mail.
On your new PC, install Outlook and open it but do not add an email address yet. This will set up Mail (Microsoft Outlook) in Control Panel. Open Mail in Control Panel...