Kerio Tech Version 6.5.2 - Manual (Page 297)

7.3 SSL-secured synchronization
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Figure 7.7 Options — switch to the Use own settings mode
Figure 7.8 Server Information — settings example
3. Enable the Use secured connection (SSL) option.
4. Specify your username password to the account which you want to synchronize the data
with (usually the same data as the login data for your email account).