Fix “Username.ost is in use and cannot be accessed” Error in Outlook?

Last updated on March 20th, 2022 at 07:22 am

The Last night, I was working for quite a while using Outlook using offline mode. It was running very well. But , this morning, whenever I attempted to access the OST file using Outlook the program failed provide an error message saying it was a “username OST is currently in use and cannot be found.” After looking through some discussion forums, we came to this article.

In essence, OST files (cached mode) allow individuals to operate offline. When the system is connected to the internet the necessary changes in the local mailbox as well as within the OST are added to that of the servers mailbox.

Continue reading “Fix “Username.ost is in use and cannot be accessed” Error in Outlook?”