If you can't open Outlook items in offline mode, this article is here to help. Read on for simple solutions to fix the issue.
When you switch Outlook to offline mode, you can read and compose email messages, edit your calendar and contacts, etc. This mode is particularly useful when you are traveling or when you have limited internet connectivity.
Opening Outlook without an internet connection is possible with the help of files called ‘OST’. They store a copy of the information on the server on your local computer. This information is what allows Outlook to be used without an Internet connection. Once internet connectivity is established, the OST file synchronizes with data on the server mailbox.
Although Offline mode is useful, some users complain about issues when using it. This article focuses on a common error about ‘Outlook not starting when Offline’ and potential solutions. The error reads:
‘Cannot start Microsoft Outlook. Cannot open the Outlook window. The set of folders cannot be opened. The operation cannot be performed because the connection to the server is offline.
Before we go into solutions for the error, an important point to consider is that this situation mostly occurs when you are offline and try to start Outlook. It is not seen when you already have Outlook open and switch to offline mode.
Usually, when your folders are on your favorites list (mainly IMAP folders), Outlook waits for the server to be connected and thus creates problems when Outlook is ‘Offline’. To resolve this, turn ‘OFF’ Favorites on your Email navigation.
To do so, go to the ‘View’ menu and uncheck ‘Favorites’ in the folder pane. This helps resolve your issue in some cases.
Sometimes, if your OST file is damaged, Outlook may have issues working in Offline mode. To resolve the Outlook error, you can delete the old .ost file and re-create the file. To delete the old .ost file, follow the steps below.
Once you have deleted the old.ost file, you can create a new OST file easily by following the steps below.
This will create a new OST file. Now restart ‘Outlook’ and check if the issue is resolved.
However, if you do not want to go through the hassle of deleting your old .ost file and re-creating a new one, you can use OST to PST converter. This will help you repair the OST file and convert it to PST. After conversion, all Outlook items such as emails, contacts, calendars, etc. will be saved to the new PST file.
The software is designed to work with all versions of Outlook. It can be used to repair .ost files that are damaged due to synchronization issues or due to hardware or software errors in only a few clicks.
Avoid corruption in .ost files
To avoid corruption in .ost files, make sure you terminate Outlook properly. Also, make sure you don’t try syncing files with the server when the internet connection is too slow. Make sure the .ost file is within the size limit to avoid any corruption or damage additionally, if you have been dealing with large-sized PST file issues. Click to learn how to fix a pst file that is too large.
Yes, you can open an Outlook account without an email, to create one:
- Close Outlook and click Windows + R
- Type Outlook.exe /PIM and then click OK.
Yes, you can use Office 365 offline with Office 365 Business Premium or Office 365 Business subscriptions.
To switch between online and offline modes in Outlook:
- Press Alt + F to open the File tab.
- Navigate to Work offline mode in the navigation pane.
- Press Enter to toggle between online and offline mode.