I was testing Zimbra with several mail client. Everything worked fine (Thunderbird, Mac Mail, …) except outlook. Outlook always complained “None of the Authentication Methods Supported By This Client Are Supported By Your Server”.
I found several hints on the net about how to solve this but none of them helped.
After checking and rechecking the Account settings I noticed that encryption type for SMTP and IMAP where both set to “None” even if you tell outlook to use encryption. So here is what you have to do to get it working:

1. In the account settings click on “More Settings …”

2. On the Advanced Tab, change the encryption type from “none” to what ever works with your server, or just try “auto”

I really can’t understand why “none” is the default … but who understands Microsoft …

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