Jan 21 · 4 min read · When users set up Exchange, Office 365, or IMAP accounts in Microsoft Outlook, the program saves mailbox data as OST (Offline Storage Table) files. These files let people read emails while they aren't connected to the Internet, but they are very clos...
Join discussionJan 16 · 4 min read · When you use Microsoft Outlook in offline or cached Exchange mode, it saves mailbox data in OST (Offline Storage Table) files. People can read emails, see contacts, calendars, and other mailbox items even when they aren't connected to a server with t...
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Jan 15 · 5 min read · Mozilla Thunderbird is a well-known open-source email client that is known for being flexible and able to handle many different types of email. A lot of people want to move their mailbox data from Microsoft Outlook to Thunderbird so they can have mor...
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Dec 12, 2025 · 4 min read · What Is an OST File and Why Conversion Is Needed An OST (Offline Storage Table) file is created by Microsoft Outlook when users work in cached exchange mode. It allows access to emails even without an internet connection. However, OST files are tight...
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