Free busy info not able to see for one user

I have exchange 2013 server and having issue with one of the user free busy info not visible to other user. Default permission set to availabilityonly . When we open that user calendar from outlook/owa get message could not updated.
Manoj BojewarAsked:
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Ganesh Kumar ASr Infrastructure SpecialistCommented:
The permission has to be provided to shared calendar to set default to : availability and Anonymous : to Availablity. That will solve the issue.
Manoj BojewarAuthor Commented:
No Luck. Still the issue is same.
Ganesh Kumar ASr Infrastructure SpecialistCommented:
Please go through this article and check if the settings are correct on outlook.

Here is also step by step for sharing the calendar / free busy information  :
Manoj BojewarAuthor Commented:
Hello Team,

The issue was with 10000+ duplicate calendar entries in user mailbox. After deleting those duplicate entries, i am able to see user free busy info.

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Manoj BojewarAuthor Commented:
i done lot research to find the cause of this issue for just one specific user.
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