Having trouble connecting to your email from Outlook on your desktop? Follow these steps to let Outlook diagnose and fix errors in your Outlook mail profile that might be causing the issue.

All Outlook Data Files (.pst) and Offline Data Files (.ost) are listed along with the name of the account the files are associated with. If you cannot open your Outlook data file or suspect that the file is damaged, use the Inbox Repair tool (scanpst.exe) to repair errors in the file.

Follow these steps to automatically diagnose and repair Windows security problems by turning on UAC, DEP protection, Windows Firewall, and other Windows security options and features. Select the Download button on this page.

Fixes an issue in which you receive a Stop error message on a Windows 8.1, Windows Server 2012 R2, Windows 7 SP1, or Windows Server 2008 R2 SP1-based computer. Additionally, the computer crashes.

Fixes an issue in Windows 7 and in Windows Server 2008 R2 in which Message Queuing (MSMQ) may become unresponsive when you perform lots of remote reads on the MSMQ server for some time by using another computer.

Your Windows 10 device might show you a notification indicating your device needs an update. Here’s what you need to know if you see this message: “Your device has reached the end of service. Here’s how you can ensure continued support.”.

Microsoft Message Queuing (MSMQ) service running on Windows 7, Windows Vista, Windows Server 2008 or Windows Server 2008 R2 might be unable to receive messages. Therefore, messages stays in “Waiting to connect” state in the outgoing queue of the sending computers.

Cause. This issue occurs because the Task Scheduler does not correctly trigger events including the rescheduling of events when the computer is started after an overdue task. Therefore, the Software Protection Platform service (sppsvc.exe) does not start.

The issue is caused by async notifications (message class: IPM.Notification.CertExpiry) that are automatically created by Exchange Server when an expired or nearly expired (within 30 days of expiration) certificate that's used by Exchange Server exists on the system.

When you send an email message that encounters a relay error, your SMTP (outgoing) email server might return your email message with an error message such as one of the following: "The message could not be sent because one of the recipients was rejected by the server.