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I'm trying to share a discussion board with an Exchange distribution list so that the distribution list can receive alerts when the discussion board changes.

However, when I try to share the distribution list SharePoint is giving me this error:

Sorry, you are not allowed to share this with external users.

Everything I've tried to look up about this only talks about SharePoint Online- I'm looking for a solution for on-premises SharePoint 2013.

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Sorry, but sharing with external users is not available in on-premises. That is a Office 365 feature only.

  • is there an official answer to this? I mean 'sharing external users is an Office 365 feature ONLY'? Thanks. – urlreader Mar 26 '15 at 5:04
  • Couldn't find anything except of this documentation which at the end says "Applies To: SharePoint Online" – marco Mar 27 '15 at 11:42
  • It's listed in the SharePoint Online Service Description Page (which includes on-prem features): technet.microsoft.com/en-us/library/… – Steven Mulkerrins Oct 9 '15 at 16:36
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Actually, you CAN share with external users with on-prem SharePoint, but will require implementing ADFS or another PKI / STS solution.

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