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Exchange – Exchange 2016 CU8 shared Mailbox Access

One of the known issue after installing cumulative update 8 that the users will not able to access the shared mailbox directly from OWA using for example the link “” using the mail enabled user which doesn’t have mailbox.

The error that should appear for user when tried to access it using OWA as following:


Something went wrong. We couldn’t find a mailbox for this recipient. Either they don’t have a mailbox or don’t have a license assigned

Log Name: Application

Source: MSExchange OWA

Date: 26.01.2018 14:41:39

Event ID: 146

Task Category: Configuration

Level: Error

Keywords: Classic

User: N/A

Computer: E16 MBX Server


Outlook Web App failed to create ExchangePrincipal for SID. IsMonitoringRequest: False. Error: Microsoft.Exchange.Clients.Owa2.Server.Core.OwaUserHasNoMailboxAndNoLicenseAssignedException: The user does not have an Exchange mailbox.

at Microsoft.Exchange.Clients.Owa2.Server.Core.OwaClientSecurityContextIdentity.InternalCreateExchangePrincipal(HttpContextBase context)

As per Microsoft this issue should be considered as bug on the CU8 and they are working to fix it on the next CU’s but for a workaround user can access the shared mailbox using OWA light mode or Outlook for Windows client.

Ratish Nair

Microsoft MVP | Office Servers and Services

Team @MSExchangeGuru

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