+ 0 Votes Well the first thing to do is follow the path and see what is there HAL 9000 Moderator 7 years ago It's possible that the files have been moved to a different location or something similar. The user in question will also need either a Power User Account or an Admin Account as without these they will be unable to perform this action. Depending on how the LAN is setup you could have some problems if there are GP's put in place to prevent this type of thing happening or if the actual local machine isn't actually downloading from the Exchange Server. If the latter is the case you'll have to enable this user to download locally and then they will be able to move the necessary files around if they have the correct rights. I hope that is of some help to start pointing you in the right direction. Col + 0 Votes Could Be Corrupt File vgh 1 year ago It's possible the .ost file could be corrupt, especially if it gets to be very large. You can just deleted the .ost file and Outlook will create a new one with the mail that is cached on the Exchange server. + 0 Votes OST can not be accessed SarahHeff 2 years ago Check for the OST file n the Outlook folder under Programs folder. You can get your ost fiel data back using <a href="http://ostconversiontopst.blogspot.com">ost conversion to pst</a> tools + 0 Votes OST can not be accessed sachin12345 1 year ago Access OST File quickly Try ( SysTools OST Recovery ) Tool to Convert OST File into PST Format + 0 Votes Does it do the same thing when you're in non-cached mode? Rob Kuhn 1 year ago What happens if you run Outlook in non-cached mode? Does the problem also happen in OWA (Outlook Web Access)? If you get the same problem in cached or OWA then you will have to check with your Exchange (e-mail) administrator as there could be somethiing wrong with the users mailbox. If you do not see the problem in OWA or if running Outlook in non-cached mode then try renaming the OST file and then let Outlook recreate it; you might have a corrupt local cache file. + 0 Votes Check for the user permissions. mrsharyf Updated - 1 year ago 1. Not having the correct user priveliges could be the cause. Ask the administrator to check the user rights for that particular user. 2. Maybe the ost file is hidden. Set the view to "view all files and folders" + 0 Votes Could Be Corrupt File vgh 1 year ago It's possible the .ost file could be corrupt, especially if it gets to be very large. You can just deleted the .ost file and Outlook will create a new one with the mail that is cached on the Exchange server.