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mamelasFlag for Greece

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Exchange Server and Certificates

Hi there Experts,

Regarding Exchange 2010 and later versions please clarify me the following:

Q1) Which are the mandatory certificates and which are optional?

Q2) What’s the difference between the Self-Signed Certificates and Public ones?

Q3) What is the use of Self-Signed Certificated and Public?

Q4) Is there any Certificate that is installed automatically during Exchange’s initial Installation?

Thanks in advance,
Mamelas
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Amit Kumar
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M A
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Thank you both for your rapid answers!!

So, Public Certificates are being used for Clients that are accessing their Mailboxes externally (i.e. via OWA or ActiveSync)

and Self-signed certificates are being used Internally between Clients and Server (i.e. via Outlook)
but can also be used Externally giving a warning message since they are not certified.

Correct??
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Thank you very much!