Also read – Limitations
https://nishantrana.me/2018/04/27/limitations-of-multi-select-option-sets-in-dynamics-365-ce/
With July 2017 update, we can now finally create multi-select option set in Dynamics 365.
We can also use Existing Global Option Set while defining our Multi Select Option set.
This is how control looks within the form.
Within Advanced Find View
We can use the existing option set client-side methods on Multi Select Option Set.
https://msdn.microsoft.com/en-us/library/gg334409.aspx#Anchor_1
getSelectedOption() – for new_weekday multiselect option-set with value Thursday and Friday selected –
Hope it helps..
Nishant Rana's Weblog 
Reblogged this on CRM Backlog.
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All round coverage. Thumbs up.
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How can we retrieve multi-select values in crm plugin?
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I could find any way to retrieve multi select option set values in Plugins, we might have to wait for next release of the SDK.
Multi Select option set have some limitation as of now(for e.g. You can not use it in your work flows, Business Rules etc).. use it with caution.
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Thanks for the article!
By the way, now there is also a flexible alternative to the out-of-box multi select.
https://github.com/khorozhansky/Advanced-MultiSelect-for-Dynamics
It is based on N:N relations & FetchXml, and does not contain “OptionSet related limitations”.
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Thanks for sharing Pavel 🙂
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What does this look like in a view?
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