Outlook on PC not syncing with iphone mail app

Kiri Staples 0 Reputation points
2026-10-01T17:46:31.0433333+00:00

Here's my issue:

I will receive an e-mail, and it shows up in my PC Outlook app, as well as on my Mail app on my iphone. If I read the e-mail on my computer, my mail app on my phone will not recognize it as "read". As a result, I can have no unread e-mails in Outlook, but multiple unread e-mails on my iphone. Similarly, when I delete an e-mail on my PC, it is still showing up in my iphone. However, both my pc and my iphone are still receiving e-mails. Both e-mails are gmail based.

I have tried deleting and re-adding my e-mail accounts on my iphone, as well as restarting both my iphone and computer.

Outlook | Windows | New Outlook for Windows | For home
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  1. Vikki-T 11,245 Reputation points Microsoft External Staff Moderator
    2026-10-02T07:13:43.5333333+00:00

    Hi Kiri Staples,

    I can see how inconvenient this is, especially when messages continue to appear as unread on your iPhone after you have already handled them on the PC.

    Since both devices are still receiving new messages, the issue appears to affect the synchronization of actions such as marking messages as read or deleting them, rather than incoming mail itself.

    First, please sign in to Gmail on the web and perform a quick test:

    • In New Outlook on the PC, mark one recent message as read or delete it.
    • Refresh Gmail in the browser and check whether the same change appears there.
    • Then check the Mail app on the iPhone.

    If the change does not appear in Gmail on the web, the issue is likely between New Outlook and the Gmail account. In that case, please try the following:

    • Update New Outlook through Microsoft Store > Library > Get updates.
    • In Windows, open Settings > Apps > Installed apps > Outlook for Windows > Advanced options.
    • Select Repair first. If the issue continues, select Reset.
    • Add the Gmail account again by choosing Google and complete the Sign in with Google process, including all requested permissions.

    Before resetting or removing the account, please make sure that any important messages or drafts are visible in Gmail on the web. Could you also confirm whether this happens with both Gmail accounts and whether changes made directly in Gmail on the web synchronize correctly to the iPhone?

    Third-party disclaimer: The link above directs you to a third-party website. Microsoft does not control or guarantee the accuracy, availability, or privacy practices of third-party content, so please review the site’s terms and privacy policy before proceeding.

    Google confirms that Gmail should be added to third-party mail clients through Sign in with Google: Add Gmail to another email client Thank you so much for your understanding.     

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

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