Try these solutions if sent messages in Outlook.com come back with a "delivery failed" error.

As you type inside the To, Cc, or Bcc boxes, Outlook suggests recipients. The Auto-Complete List can be turned off.

Change the size of your desktop icons. To resize desktop icons, right-click (or press and hold) the desktop, point to View, then select Large icons, Medium icons, or Small icons.

Explains how to resolve relay-prohibited errors in an Outlook account.

Erfahren Sie, wie Sie Ihr Windows-Kennwort ändern oder zurücksetzen, wenn Sie es vergessen oder verloren haben.

Get tips for how to set up and test microphones in Windows.

You can refer to the contents of cells in another workbook by creating an external reference formula. An external reference (also called a link) is a reference to a cell or range on a worksheet in another Excel workbook, or a reference to a defined name in another workbook.

Learn how to fix common sync problems in Mail and Calendar apps for Windows 10, such as error codes, missing items, or outdated settings.

Erfahren Sie, wie Sie Outlook so einrichten, dass es mit E-Mail-Konten von Microsoft 365, basierend auf POP, IMAP oder Microsoft Exchange funktioniert.

了解有关在 Windows 中通过网络共享文件的信息。