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Depends on the add-in. The new Office Add-ins model supports getting add-ins directly from the store and installing them server-side, so that they are available across Outlook and OWA (and in some cases mobile apps). You can read more about it here: <a href="https://technet.microsoft.com/en-us/library/jj943753(v=exchg.150).aspx" rel="ugc">https://technet.microsoft.com/en-us/library/jj943753(v=exchg.150).aspx</a>
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Depends on the add-in. The new Office Add-ins model supports getting add-ins directly from the store and installing them server-side, so that they are available across Outlook and OWA (and in some cases mobile apps). You can read more about it here: https://technet.microsoft.com/en-us/library/jj943753(v=exchg.150).aspx [https://technet.microsoft.com/en-us/library/jj943753(v=exchg.150).aspx]

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I am installing a custom Add-in in outlook 2016 desktop. I want to know if is it possible that it will automatically be synced with my office 365 online outlook?<br />
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I have not used online version and have no idea what is possible there.
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I am installing a custom Add-in in outlook 2016 desktop. I want to know if is it possible that it will automatically be synced with my office 365 online outlook?

I have not used online version and have no idea what is possible there.

Can Outlook and office365 be synced for Add-ins

Addins

Microsoft Office is an integrated suite of applications that includes Outlook, Word, Excel, Access, PowerPoint, Visio and InfoPath, along with a number of tools to assist in making the individual components work together. Coding within and between the projects is done in Visual Basic for Applications, known as VBA.

Microsoft Office

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

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.

Microsoft 365

A desktop computer is a personal computer designed for use at a single location due to its size and power requirements, usually by one person. The most common configuration has a case that houses the power supply, motherboard, disk storage (usually one or more hard disk drives and optical disc drives); a keyboard and mouse for input; and computer monitor and printer for output. The case may be oriented horizontally and placed atop a desk or vertically and placed underneath or beside a desk.