We're investigating the issues and will update this page when a fix is available. In the meantime, please use the workarounds suggested for each issue. If you typically use an Outlook.com account for email, this issue can occur if there are multiple aliases on the account and the 3rd party email address is the primary alias. Sometimes, issues can be caused rebuild Outlook data file quickly due to a corrupt Outlook OST file.

Outlook known issues in the December 2018 updates

Read how to Add your Outlook.com account to another mail app. This occurs because custom form script is now disabled by default. TrustedTech is dedicated to being a reliable resource for all software and technology support needs.

Outlook known issues in the June 2018 updates

Right-click the folder, and then click Properties to check your permissions for the folder. See the folder owner or your administrator to change your permissions. The loading of unregistered MAPI services has been disabled by default to FixTechGuide mailbox repair steps make Outlook more secure. Currently, you can't use Outlook on Windows to edit calendars that are shared with your Outlook.com account, even if you've reconnected your Outlook.com account to Outlook. We're working to make it possible to edit shared calendars in Outlook 2016 for Windows.

Outlook known issues in the Feb 2018 updates

• To repair corrupt OST file, you can use the built-in ScanPST.exe tool provided by Microsoft.
• Some antivirus software may block Outlook from connecting to the internet.
• However, sometimes, it can experience connectivity issues, especially when using a Microsoft 365 account.
• Find solutions to common problems or get help from a support agent.
• Sometimes, issues can be caused due to a corrupt Outlook OST file.
• This can be exploited by creating a file together with an OLE object in such a way to cause MAPI to load a DLL from a network share when the OLE object is activated.

The person who sent you the invitation will need to remove your permissions and then send a new invitation. If you manually type in the secondary connected account email address in the "From" field, the email is sent as "On behalf of" your primary Outlook.com account. Your antivirus software can also cause issues with Outlook connectivity. Some antivirus software may block Outlook from connecting to the internet. Check your antivirus software’s setting

VBScript does not run or you receive malicious code warning when using a custom form for Outlook

If you're looking for smarter ways to manage, secure, or optimize your Microsoft 365 (M365) environment, our U.S.-based team is here to help. Microsoft offers several built-in tools to help identify and resolve persistent issues. On January 16, 2025, an update for Microsoft 365 Apps will be released in the Current Channel, as can be seen from the entry MC in the Microsoft 365 Message Center. If anyone finds a more permanent solution, I would appreciate it. It seems like something went wrong on Microsoft update and they might recall it or fix it, so we might need to wait untill that. Find solutions to common problems or get help from a support agent.

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