Outlook 2010 account setup fails in particular domain

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Outlook version
Outlook 2010 32 bit
Email Account
I have a problem setting up a particular ssl account in MS Outlook. This is in addition to the user's main account which works OK

The machine is a Dell XPS L322X running Windows 7 Pro SP1. Outlook is MS Office 2010 Pro Plus Outlook V14.0.7232.5000 32 bit. The machine has Trend Micro Maximum Security 15.0

The problem account is on a hosted domain with SSL IMAP email accounts.

I set up the account as per the hosting cpanel instructions with SSL ports 993 and 465. I get Outlook Test Account error message: -

“Log onto incoming mail server (IMAP): A secure connection to the server cannot be established.

Send test e-mail message: Your server does not support the connection encryption type you have specified. Try changing the encryption method. Contact your mail server administrator or Internet service provider (ISP) for additional assistance.”

Action so far in localising problem: -

Tried the account in Outlook on other laptops – works ok.

Tried account on this laptop with other mail client (Mailbird) – works OK.

Tried Telnet to the mailserver ports – works ok.

Conclusion – problem confined to Outlook on this laptop.

Tried differently hosted SSL email account in Outlook (with mail.com) – works OK.

Tried different email accounts in the problem domain – problem persists.

Tried both pausing and later uninstalling Trend Micro Max Sec – problem persists (re-installed afterwards.).


Outlook on this machine rejects the problem domain.

Tried repairing Outlook – problem persists.

Tried opening Outlook without add-ons – problem persists

Tried Outlook – New Profile – problem persists.

Your advice on how to proceed would be welcome.
For the record, and in case it helps anyone else, the problem was fixed by uninstalling Office 2010 Pro Plus, installing Office 2013 Pro Plus, and then installing all updates. The cause appears to have been related to a failed update KB3140245.
Thank you for your reply. I found the support paper you mentioned and tried installing the TLS 1.1 and 1.2 updates but found that the KB patch was shown as having been installed. The Easy fix did not populate the registry subkeys as promised, so I added them by hand. But the problem remained.
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