Schema Sync after AAD Connect installation

Hi,

we have a fresh Windows Domain (Win2k12) and installed AAD Connect (latest version) and established the sync to an Office 365 tenant with default settings.

Now, after the syncrhonization ist working fine, I installed the Exchange2013 schema extension in the AD.
I did this, because I want the possbility to edit some AD-Attributes, that are not available in the cloud (msExchHideFromAddressList) with AdsiEdit. (I know it is not supported).

After the schema extension I did a "Refresh Directory Schema" in Azure AAD Connect.

After that the new attribute "msExchHideFromAddressList" was still not synching to the cloud.
I found out, that I have to do following:

"Synchronization Rule Editor":
Rule:  "In from AD - User Common"

There I added a transformation that maps the attribute.
OK, this is working now.

But how do I know which Exchange-Attributes would bei used in the future?
Which attributes do I have to map?
Or is there a possibility the map the needed attributes automatically?

Many thanks in advance!
Roland
SystemadministrationAsked:
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Vasil Michev (MVP)Connect With a Mentor Commented:
Oh, so I misunderstood you then, you already have the rules :) Yes, simply populate the alias/mailnickname attribute and you should be all set. It's the portion before the @ sign, so for example is the user address is vasil@domain.com, the alias can be simply "vasil" (and it's not needed to be related to the actual email).
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Vasil Michev (MVP)Commented:
The rules should have been updated after you run the schema refresh. If this didnt happen, the best thing to do is simply reinstall AAD Connect, it will detect the Exchange schema extentions and add the needed rules for you.
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SystemadministrationConnect With a Mentor Author Commented:
OK, I found something else.
The refresh added some new rules, "In from AD - User Exchange" for example.
The rule has a scope "mailnickname ISNOTNULL".
This rule syncs all the exchange attributes.

I think I could set the mailaddress in mailnickname and I would be save, correct?

Is it OK to set the mailnickname this way or would this make any trouble using Online Exchange?
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