I use Outlook 2010 as email client.
To get in contact with my email providers it is neccessary to have modern TLS protocols, TLS1.0 / SSL is no more supported.
And to solve this problem I use sTunnel (latest version for 32bit is 5.49).
The advantage of sTunnel is that the Windows certificate storage can be used, which greatly simplifies the configuration in this case.
So sTunnel only needs to be installed and activated as a service, as well as using this simple configuration (example of stunnel.conf):
debug = 4
engine = capi
options = NO_SSLv2
options = NO_SSLv3
options = NO_TLSv1
[gmx-pop3s]
client = yes
EngineID = capi
accept = localhost:xxxx
connect = pop.gmx.net:995
[gmx-smpts]
client = yes
EngineID = capi
accept = localhost:yyyy
connect = mail.gmx.net:465
In Outlook the local ports are set as default connection (server localhost and port POP xxxx / SMPT yyyy)
Thats all.
It works also for other email clients, so this may be a good advice for a configuration.