GrinMark Synchronizer does not need mailbox passwords of individual users. Instead it uses single Exchange account (called Exchange Service Account) to connect to Exchange via EWS API and impersonate required users. In order to test Exchange connectivity Microsoft developed a handy tool
Remote Connectivity Analyzer. It is available online at
If you can not connect to Exchange and want to know why - navigate the url, choose
Service Account Access option, press
Next button, fill-in the form and get the result in XML/HTML format.
Example of test results. Save in XML or HTML format (buttons highlighted).
Beginning of HTML results: