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Importance of .Net framework for Office365

See in installation notes for proplus that version 3.5 .Net Framework required for regular office applications and 4.5 clr needed for Skype for Business.

These don't come with Windows 10 natively . Using a BYOD model just wondering what the importance of .Net is and what errors it will generate if the correct version isn't used?
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Jackie Man IT Manager
Distinguished Expert 2019

Commented:
Using a BYOD model just wondering what the importance of .Net is and what errors it will generate if the correct version isn't used?

No error. You just cannot install it and you will be prompted / required to install .Net framework as the click to run installer will check the requirements before it will install the app.

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Commented:
If it's any version prior to 3.5 or below will the same message occur that it won't install?

Also if 3.5 is installed will Skype for business work?
Says .Net 4.5 clr required
IT Manager
Distinguished Expert 2019
Commented:
If your Skype for business is installed on a standalone (not domain joint) computer, you can skip .Net 3.5.

.Net 3.5 is needed for directory sync on single sign-on (SSO) for Skype for business.

The best practice is to install .Net 3.5 for domain joint computer if the AD is not the latest version.