As it turned out, if Lync and Outlook are started at the same time, changing Offline mode is not saved after Outlook is closed (Lync somehow blocks saving offline mode settings, maybe, due to its constant connection to Exchange). ![]() The solution was unexpected: all users who reported Outlook start offline problem had Skype for Business (Lync) installed. We reinstalled and repaired Outlook – nothing helped. We tried to delete an Outlook profile and re-create it again.We started Outlook in the Safe Mode ( outlook.exe /safe command) and disabled all Outlook add-ons: the problem persisted.In Exchange 2013/2016, the main protocol for connecting Outlook clients to CAS is HTTPS ( MAPI over HTTP), so it suffices to check the availability of port TCP/443 ![]() You can do it using the Test-NetConnection cmdlet: tnc ber-msgcas –port 135 – the port is available. ![]()
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