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Are you using Exchange? &nbsp;Turn off Cached Exchange Mode in Outlook, exit, then reopen Outlook. &nbsp;Do you see the emails now? &nbsp;If yes then delete the OST file and let Outlook recreate it because it may be damaged. &nbsp;Alternatively, you can delete the email profile then recreate it. &nbsp;See the links below:<br />
<br />
<a href="https://support.office.com/en-us/article/turn-on-cached-exchange-mode-7885af08-9a60-4ec3-850a-e221c1ed0c1c" rel="ugc">https://support.office.com/en-us/article/turn-on-cached-exchange-mode-7885af08-9a60-4ec3-850a-e221c1ed0c1c</a><br />
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<a href="https://www.nucleustechnologies.com/blog/how-to-create-and-recover-damage-ost-file-in-outlook-2013/" rel="ugc">https://www.nucleustechnologies.com/blog/how-to-create-and-recover-damage-ost-file-in-outlook-2013/</a>
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Are you using Exchange?  Turn off Cached Exchange Mode in Outlook, exit, then reopen Outlook.  Do you see the emails now?  If yes then delete the OST file and let Outlook recreate it because it may be damaged.  Alternatively, you can delete the email profile then recreate it.  See the links below:

https://support.office.com/en-us/article/turn-on-cached-exchange-mode-7885af08-9a60-4ec3-850a-e221c1ed0c1c [https://support.office.com/en-us/article/turn-on-cached-exchange-mode-7885af08-9a60-4ec3-850a-e221c1ed0c1c]

https://www.nucleustechnologies.com/blog/how-to-create-and-recover-damage-ost-file-in-outlook-2013/ [https://www.nucleustechnologies.com/blog/how-to-create-and-recover-damage-ost-file-in-outlook-2013/]

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could be your cached exchange mode settings<br />
<a href="https://filedb.experts-exchange.com/incoming/2018/04_w18/1307590/2018-04-30_23-00-00.jpg" target="_blank" title="cached mode settings (237 KB)"><img alt="cached mode settings" class="file-block lazyload" style="max-width: 800px;" data-src="https://filedb.experts-exchange.com/incoming/2018/04_w18/800_1307590/2018-04-30_23-00-00.jpg" /></a>
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could be your cached exchange mode settings
cached mode settingshttps://filedb.experts-exchange.com/incoming/2018/04_w18/1307590/2018-04-30_23-00-00.jpg

2018-04-30_23-00-00.jpg

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Hi David, I think you might have posted the screenshot by mistake.
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Hi David, I think you might have posted the screenshot by mistake.

2018-04-30_23-22-51.jpg

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We're using IMail, which all the emails are still showing there. &nbsp;And I expressed it wrong. &nbsp;All emails from Feb 19th 2018 up until yesterday afternoon are gone. He is still getting emails, resuming yesterday afternoon, but the whole 2/19 - 4/30 are gone in Outlook 2016 for the most part.
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We're using IMail, which all the emails are still showing there.  And I expressed it wrong.  All emails from Feb 19th 2018 up until yesterday afternoon are gone. He is still getting emails, resuming yesterday afternoon, but the whole 2/19 - 4/30 are gone in Outlook 2016 for the most part.

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Outlook 2016 only shows emails since Feb. 19, 2018. &nbsp;Cleared all filters and still only shows emails going back so far. &nbsp;IMail shows the correct amount of emails.
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Outlook 2016 only shows emails since Feb. 19, 2018.  Cleared all filters and still only shows emails going back so far.  IMail shows the correct amount of emails.

Not all email showing up in Outlook 2016

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Outlook

An email client, email reader or more formally mail user agent (MUA) is a computer program used to access and manage a user's email. A web application that provides message management, composition, and reception functions is sometimes also considered an email client, but more commonly referred to as webmail.