• Mac Calendar Not Syncing
• Apple Mail Not Syncing

I've rolled out O365 to networks with say 10x iMac's before. Have used both Mac Mail and Outlook. Both work OK..not as well as Windows as you'd expect, but well enough. I mainly see issues with O365 accounts on Mac's not syncing when the site has slow internet, especially if that's combined with large-ish mailboxes. The mail client tends to get stuck downloading all the email attachments and just stalls. What is the speed of the internet there?

Jun 28, 2017  Mail, Calendars, Reminders, and Notes all seem to synchronize properly with the Exchange Server. However, for some reason, new entries in the native Contacts app are not syncing with the Exchange Server and are, therefore, not available to other devices (iPad, iPhone) that are also set up with the identical account information. Feb 27, 2020  Exchange accounts are not included when you import data from Mail app into Outlook for Mac. To use your Exchange account, set up the account in Outlook for Mac. Outlook for Mac does not support “direct booking” as Outlook for Windows does. Install epson software for mac. Direct booking is a MAPI-only feature and Outlook for Mac uses Exchange Web Services. However, you can.

1. Feb 22, 2018  Regarding this, you should create an app password. If you are not clear about this, you can get help from your Office 365 admin. If your account does not be turned on two-step authentication, and the issue persists, please try to remove your account from Mac Calendar App.
2. Apr 22, 2018  For some reason the other day my Exchange contacts stopped syncing with my Mac and other devices. Thus, when I get a text message from someone in my contacts, instead of their name, their phone number shows up, and nothing shows up under Exchange contacts in the Contacts app. At the same time mail is syncing completely normally.

macOS is fully up to date? Do you have any AV installed, if so have you tried removing it. Any other programs running at logon that could be interfering? Disable any Mac Mail addons. Also, slow spinning hard drives in older iMac's tend to lag out the mail apps, which tends to bring user complaints.

If your Mac is connected to the Internet but suddenly stops sending email, you should generally try again later, and if necessary work with your email provider to resolve. If you're using Apple's iCloud Mail, learn how to resolve issues with iCloud Mail.

Check for status messages

You might see a status icon such as a lightning bolt or warning symbol next to your account's inbox in the Mail sidebar, or in the upper-right corner of the Mail window. Click it to learn more.

• If the status is Network Offline, make sure that your Mac is connected to the Internet, then try again.
• If the status is Login Failed, check with your email provider to be sure that your account is set up correctly on your Mac.
• If Mail asks for your password, but entering the password doesn't help, find out why your email provider is rejecting your password.
• If your email service is temporarily unavailable, your email provider might have a status message on their website. For example, Apple's system status page shows the status of iCloud Mail. Status pages are also available for other email services, such as Gmail and Outlook. Some brief service outages might not appear on a system status page, so you might want to wait a few hours and try again.

Test using webmail

Mac Calendar Not Syncing

Many email providers offer webmail, which is a way to use email with a web browser such as Safari, instead of with an email app such as Mail. For example, if you're using an iCloud Mail account, you can use iCloud.com to send and receive email.

Apple Mail Not Syncing

Webmail is a good way to verify that your account is valid and you can sign in to it from the web, but it doesn't mean that your account is set up correctly in Mail. Your email provider can help you verify your email settings and check for other issues that affect sending or receiving email.