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on November 19, 2025
<img src="https://www.emailassistantpro.com/blog//wp-content/uploads/2022/08/Outlook-Keeps-Crashing.webp"; style="display: block;margin-left:auto;margin-right:auto;" alt="Outlook not syncing emails" class="wp-post-image" />
If you're using an Exchange account that requires advanced settings, you'll need to remove the account and add it again using advanced settings. To add the account using advanced settings, see Add an account using advanced setup. If you have a Google, Yahoo! Mail, iCloud, IMAP, or POP3 account, check the settings in the advanced mailbox settings to make sure they're configured to your email provider's specification. If you're using an Outlook.com, Microsoft 365, or Exchange account, you won't have advanced mailbox settings unless the account was set up using advanced setup. If your problem is how quickly mail populates, change the download preference to headers then full items.
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From there, make sure that the proper calendars are selected. If none of these steps address the syncing problem, escalate the issue to the IT team. Third-party firewalls or antivirus software might prevent you from syncing your email and calendar events.
Turn off Windows Defender Security Center
How do I fix Outlook not updating emails? <br><br>
In some cases, there might be outages or network-related issues, such as problems with a VPN. Mail flow issues can also arise out of other circumstances, such as a user having a mailbox in both Exchange Online and Exchange on-premises. In some cases, an issue might be related to MDM settings, such as restrictions on Outlook functionality, or user account and mailbox settings in Exchange. Sometimes an error appears in the Mail and Calendar apps when the apps try to sync new email or <a href="http://api.e-toys.cn/page/jumpDownload/?url=http%3a%2f%2fUnivietravel.com%2Findex.php%3Flanguage%3Dvi%26nv%3Dusers%26nvvithemever%3Dt%26nv_redirect%3DaHR0cDovL0Itd2F5cy5zYWt1cmEubmUuanAvY2dpLWJpbi95eWJicy95eWJicy5jZ2k%2FbGlzdD10aHJlYWQ&app_id=15&platform=IOS&fwh_id=0">permainan slot gacor</a> calendar events. These syncing problems usually happen because of issues like a damaged Outlook profile, poor internet connection, or a corrupted OST file.
<img src="https://windowsreport.com/wp-content/uploads/2019/06/something-went-wrong-and-outlook-couldnt-set-up-account-1.png"; style="display: block;margin-left:auto;margin-right:auto;" alt="Outlook not syncing emails" class="aligncenter" />
Resolve sync issues in Mail and Calendar apps in Windows 10
If your problem is how quickly mail populates, change the download preference to headers then full items.The most common cause of an out-of-date account is an incorrect password.Online archive can take 24 hours or more to complete, it depends on what you have it set to archive.Sometimes an error appears in the Mail and Calendar apps when the apps try to sync new email or calendar events.If it's a server-side issue, the admin likely needs to find a way to fix it inside the IT environment.If you're using an Exchange account that requires advanced settings, you'll need to remove the account and add it again using advanced settings.
When using Microsoft Teams on an iPhone, slow performance and app crashes can bring mobile work to a halt. Many issues come down to internet bandwidth or low storage space. If there's a feature you think is missing from the Mail and Calendar apps, or if a feature in isn't working properly, you can provide feedback directly to the Mail and Calendar team.
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IT teams should build a plan to tackle these threats and make sure users are aware of the security concerns. If none of these steps work, the issue might be on the server side, which can make the troubleshooting process more complex. Admins must think about the nature of the problem and which users it's affecting to find the source. For example, ActiveSync might not be enabled, or there might be a problem with the ActiveSync certificate settings. In some cases, IT might be able to track down a problem by examining the Exchange logs.
Outlook accounts not syncing
Change the limit to 1 year, wait for the sync, check the size of the OST once Outlook confirms all sync has been completed. Now change the slider to 2 years and follow the same principal. Outlook has a hard limit of 50GB per OST, decrease the period of e-mails that get cached, delete the cache, and re-run the sync.