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The way <b>&quot;mark as done&quot;</b> works in Gmail is to move the message from INBOX to DONE folder/tab.<br />
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This is a 100% Gmail-ism.<br />
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You can simulate this by creating a DONE folder + moving messages yourself.<br />
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To create a feature which works exactly the same, best approach will be to write an extension for Thunderbird + then access your iCloud + Outlook accounts from Thunderbird, via IMAP4 protocol.<br />
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The Outlook mail client might provide some way to write extensions also + likely far more difficult than TBird extension writing.
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The way "mark as done" works in Gmail is to move the message from INBOX to DONE folder/tab.

This is a 100% Gmail-ism.

You can simulate this by creating a DONE folder + moving messages yourself.

To create a feature which works exactly the same, best approach will be to write an extension for Thunderbird + then access your iCloud + Outlook accounts from Thunderbird, via IMAP4 protocol.

The Outlook mail client might provide some way to write extensions also + likely far more difficult than TBird extension writing.

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I had this question after viewing <a href="https://www.experts-exchange.com/questions/28946229/Outlook-2016-on-Mac-Simulating-Mark-as-Done-Feature-for-GMAIL-Account.html" rel="ugc">Outlook 2016 on Mac: Simulating Mark as Done Feature for GMAIL Account</a>.<br />
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I could not find the check mark in outlook for my gmail account. It is there for my icloud and my outlook account, but not for my gmail account... such a simple tool is not working..
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I had this question after viewing Outlook 2016 on Mac: Simulating Mark as Done Feature for GMAIL Account (https://www.experts-exchange.com/questions/28946229/Outlook-2016-on-Mac-Simulating-Mark-as-Done-Feature-for-GMAIL-Account.html).

I could not find the check mark in outlook for my gmail account. It is there for my icloud and my outlook account, but not for my gmail account... such a simple tool is not working..

Outlook for Mac - gmail

Programs written for the Apple operating systems are distinguished from software created for other operating systems in that it must be approved by Apple for use on its devices, whether it is from Apple (Final Cut, iWork, Keynote, Logic Pro and GarageBand are popular titles), or is a third party application from Parallels, Nuance, Microsoft and Amazon, among many others.

Apple Software

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

Google’s Gmail is a free email service that allows users to access their email on the web or by using third-party programs that synchronize email content through POP or IMAP protocols.