When you enable this option, calendar actions are sent directly to the server instead of having to be synchronized from local storage. To fix performance issues that affect your Calendar, try the following methods. Also, determine whether any local network issues might be causing the problem. This includes issues that affect your local proxy server, firewall, or Internet service provider. Outlook uses an .ost file only if the Exchange email account is configured to use Cached Exchange Mode.

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. After installing the September Public Update, Outlook 2007 displays mixed languages in the user interface. Ensure that your Outlook recycle bin is empty and then run the Compact Now command to complete the mailbox housekeeping exercise. This, along with all other features, is conveniently available across all platforms for efficient inbox management on any device.

One more suggestion is to acquire the skills of Microsoft 365 backups to recover your organization’s data in cases of unpredictable system issues and glitches. Also, don’t forget to update your shared calendars frequently and update your Windows machine. Refer to below blog to speed-up Outlook application in Windows 10 or 11 operating system. I used the information to create a Registry Entry that will cause Outlook to check for new mail every 15 seconds. Another alternative might be Outlook on the web, which would sit somewhere between Outlook mobile and Outlook desktop in most cases. There are a few simple steps you can take to keep your Outlook running smoothly.

This happens to accounts that are configured in the iOS Mail app. The loading of unregistered MAPI services has been disabled by default to make Outlook more secure. To access the calendar shared with your Microsoft 365 for business account, you'll need to accept the invitation from Outlook on the web, iOS, or Android. If you've already clicked the Accept button in Outlook 2016, you won't be able to re-accept the invitation from another Outlook application. The person who sent you the invitation will need to remove your permissions and then send a new invitation. 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.

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. 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. You can use common Outlook startup issues Microsoft Support and Recovery Assistant to diagnose both Calendar and Mail issues that affect Outlook. To download and install the Assistant, see About Microsoft Support and Recovery Assistant. In some cases, an Outlook messaging profile may be misconfigured.

Corrupted or broken files in Microsoft Office or Microsoft 365 can cause serious performance issues. Use the repair your office option in Control Panel to get back on track. A virus or antivirus software issue can wreak havoc on your system, and Outlook won’t escape unscathed. Run a scan using reliable antivirus tools. Outlook constantly Not Responding if the Outlook data files contain errors.

From time to time Microsoft Outlook adopts quite an annoying habit to hang around even if the user persistently attempts to shut it down. This problem existed in earlier versions and it may occur with recent Outlook 2013 and 2010. So for about the past month, my Outlook constantly freezes, the window grays out, and I get a "not responding" error message. I am not quite sure common Outlook startup issues when this started, otherwise I would have rolled back updates and/or removed recently installed apps. I recently uninstalled and reinstalled Office but it only made the issue worse.

Sometimes, the issue may be because a file that you are trying to open has been infected with a virus and your antivirus program has been unable to remove it. Using all the above methods, users can fix Outlook Not Responding issues. Sometimes, there might be a high chance that the PST file may be corrupted. In that case, users want to go with a secure way to repair their corrupt or damaged PST files.

Julia Gulevich is an email marketing expert and customer support professional at Geminds LLC with more than 15 years of experience. Author of numerous blog posts, publications, and articles about email marketing and deliverability. The recipient’s server may send a bounce notification explaining why it could not deliver the message. But it doesn’t happen all the time and you may not even know that the recipient didn’t receive your email. This kind of situation can be very frustrating, especially if the content is urgent or vital.