
Now right click by mouse button on Outlook and select New and then select Key and then type PST and hit Enter key to apply.Now in the same way as editing registry process go till Outlook after expanding 16.0 for Outlook 2016, 15.0 for Outlook 2013 and 14.0 for Outlook 2010.Again go to Registry Editor by typing regedit in search of start menu or by pressing Window Key + R as we have discussed in editing registry steps.What if the registry is not created? In this case you have to create registry manually.Ĭreate Registry to Increase OST File Size Limit The next time Outlook starts online.Note: The above way will work if the registry value is already created. Thus, to disable running Outlook in the offline mode, you just have to close Lync / Skype4B (make sure that there are no processes in the Task Manager) and disable Work Offline mode in Outlook.Īfter that you can run your Lync (Skype4B). 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. In Exchange 2010, you need to check the CAS server availability from the user computer thought port TCP/135 (RPC locator).The accessibility of a mailbox through the OWA interface: the mailbox was available.
