How to enable TSL for IMAP connection in Outlook 2003 under Windows 7?

[javic]

Yeah, I know Outlook 2003 is wicked old but... I just signed up for ProtonMail. To connect my Outlook client to their server I need to go through the Proton Mail Bridge which requires TSL for both incoming and outgoing connections. Following the instructions they provide, I was able to set up a new Outlook email account as required except for one thing: on the Advanced tab of the Internet E-mail Settings dialog, there is no option to select TSL for encryption. It offers only SSL. (see attachment)

In researching this problem I found various posts saying I needed to use particular port numbers for TSL, but Proton Mail Bridge specifies the port numbers that must be used. I also found posts saying I needed to install Windows Update KB3140245 to enable TSL on Win7. I've installed it. I also found a post on this site with a REG file that adds some Registry keys under HKLM\...\SCHANNELS\Protocols. I've installed that too. But I still see no TSL option in Outlook.

I've read that Outlook 2003 should be able to support TSL. Does anybody know how to get it working?

 

[torchwood]

hmmm
have you enabled tls in features, allthough you installed the update you may also need to do this

thats a really old prog, does it support smb2

is your system upto date windows update wise
got a sneaky feeling outlook doesn't support smb1, now depracted

 

[javic]

Re. enabling TLS: I don't see anything about it in Windows Features -- see attachment.

What's "smb2"? (My original post pretty much covers everything I know about this part of Windows

Re. updates: I'm very selective about the updates I install, and am probably far behind. But I do have SP 1 installed. (One note I saw someplace said SP 1 + KB3140245 was all that's needed to enable TLS. Clearly that's not the case.)

 

[javic]

FWIW I think I found one solution to my problem: switch from Outlook to Thunderbird. Thunderbird supports TSL out of the box with no system changes, so it appears to be an issue with my (old) version of Outlook, not with Win7.