If you open MS Outlook and see an error message, Outlook is using an old copy of your Outlook data file (.ost), then use ...

Microsoft Office Outlook maintains everything in a data file, also called PST or OST file. It is an offline copy of mailbox data stored on a local PC. In case of ...

Several Outlook users, on different forums, have reported encountering the error “OST file cannot be opened,” when trying to open the application or sending ...

Microsoft Outlook is a robust email client for managing emails, calendars, contacts, and tasks. However, Outlook users occasionally encounter a common and potentially disruptive issue: corruption in ...

Microsoft Outlook has features to make emailing easier and faster. However, several people have reported some troubles when using it. If you find it difficult accessing your personal data file, you ...

Microsoftは2014年に公開したOutlookのサポート情報で、マルウェア感染を回避するためとして添付ファイルのブロックを実施していることを発表(参考：Blocked attachments in Outlook - Microsoft Support)。それ以来ブロックリストは拡張を続けており、現在は128個のファイル ...