I currently have office 2010 installed, and am trying to assist a coworker who's still using 2007 with VSTO solution. This is turning into a mess since my copy of visual studio thrashes the project files updating them to point to the O2010 dlls. If I were to install office 2007 beside 2010 would I be able to open the solution without the upgrade wizard mangling everything, or are my only options making significant architectural changes to the solution or reverting to O2007 until my employer makes O2010 the new standard.
If you have a Microsoft 365 subscription or non-subscription version such as Office Home and Business 2021, 2019, 2016 or 2013, in most cases you can't run these versions together on the same computer.
There are two ways to have a Microsoft Office 365 integration: through the COM/VSTO add-in or an Office Add-in.
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The term side-by-side means that you can install and maintain multiple versions of a product on the same computer. For VSPackages, that means a user can have several Visual Studio versions installed on the same computer.
You cannot run Outlook versions side-by-side (and here).
You can still target both 2007 and 2010, but you need to research embedded interop types.
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