This is due to the deprecation of the classic offline mode in Outlook, which is an online mode connection to Microsoft Exchange Server. This is what happens when you try to do something offline using a tool designed for online use. But the good news is that there is a fix for this. Users have also described this issue on Microsoft’s forum:

Here’s how to change the location of the offline Outlook Data File:

1. Create a new Outlook Profile and change the location of the .ost file

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2. Change the location via the ForceOSTPath registry entry

We suggest you to back up the registry before you change the settings. If you modify the registry incorrectly, you can use the back up to restore the registry. If you also want to monitor registry changes, this tool can help you. If the following solutions were helpful, please let us know in the comment section below. RELATED STORIES YOU NEED TO CHECK OUT:

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