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“Anonymous Access” should be enabled in IIS on the EWS virtual directory.
Check DNS Settings
SRV Record:
Service: _autodiscover
Protocol: _tcp
Port Number: 443
Host: mail.domain.com
Protocol: _tcp
Port Number: 443
Host: mail.domain.com
A Record: autodiscover.domain.com point to mail.domain.com
Autodiscover SAN entry in Exchange Certificate.
or
- Open Registry Editor. Go to below path.
HKEY_CURRENT_US ER/Software/Micro soft/Office/12.0/Outlook/Options/ Calendar - Create new DWORD value “UseLegacyFB” with value data ‘1‘
- Exit from registry
- Restart outlook using “outlook/cleanfreebusy”.
Start > Run > Outlook /cleanfreebusy
or
Recreate Autodiscover Virtual Directory
Remove:
Remove-AutodiscoverVirtualDirectory –Identity “CAS_SVR_Name\Autodiscover (Default Web Site)”
Then Recreate it:
New-AutodiscoverVirtualDirectory -WebsiteName “Default Web Site” -WindowsAuthentication $true -BasicAuthentication $true
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