If you're using an Exchange email account, you can delete the offline Outlook Data File (.ost) and Outlook will recreate the offline Outlook Data File (.ost) the next time you open Outlook.

Outlook Data Files (.ost) are used when you have an Exchange account and want to work offline or use or use the default Cached Exchange Mode. This type of data file is also used for …

Outlook Data Files (.pst), or Personal Storage Tables files, contain Outlook user messages and other Outlook items, such as contacts, appointments, tasks, notes, and journal entries. You …

Learn how to find out the size of your mailbox and its folders and how to compact Outlook Data Files (.pst and .ost), which might help improve performance.

如果具有 Exchange 帐户且想要脱机工作或使用默认 缓存 Exchange 模式，则会用到 Outlook 数据文件 (.ost)。 如果帐户是通过适用于 Outlook.com（前身为 Hotmail）的 Outlook Connector …

Some accounts (IMAP, Microsoft Exchange Server, and Outlook.com) use an offline Outlook Data File (.ost). This is a synchronized copy of the messages saved on a server.

如果您使用的是 Exchange 電子郵件帳戶，您可以刪除離線 Outlook 數據檔 (.ost) ，Outlook 會在下次開啟 Outlook 時重新建立離線 Outlook 資料檔 (.ost) 。

You may have an Offline Folders (.ost) file, but that file is automatically recreated by Outlook when you add a new email account. You can't move that file from one computer to another.

如果您使用的是 Exchange 電子郵件帳戶，您可以刪除離線 Outlook 數據檔 (.ost) ，Outlook 會在下次開啟 Outlook 時重新建立離線 Outlook 資料檔 (.ost) 。

當您有 Exchange 帳戶，並且想要離線工作或使用預設 Exchange 快取模式 (離線) 時，就會使用 Outlook 資料檔 (.ost)。 此資料檔類型也適用於您透過適用於 Outlook.com (先前稱為 Hotmail) …