![]() Outlook is forced or improperly shut down.An incompatible or faulty add-in can affect Outlook’s performance and cause OST file corruption.If the OST file reaches the maximum limit, it creates performance issues or may get damaged. Outlook has certain file size limitations. ![]() Let’s take a look at some common reasons. ![]() However, sometimes, the OST file becomes corrupt or inaccessible due to several reasons. This file allows you to access the mailbox data offline. When you add Gmail to your Outlook email account (IMAP enabled), a local copy (OST file) of the mailbox is stored on the computer. OST is an offline data file that stores a copy of the mailbox on the computer, when you set up an IMAP email account in Outlook.
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