Exchange 2013 "Could not open mailbox Microsoft System Attendant" room mailbox

I'm hoping someone else can help me here. I've searched google and technet and have found other people who experience this issue, but noone has seemed to have a fix.I'm doing a migration from Exchange 2007 to 2013. Everything is working great and the 2007 has now been uninstalled. I'm noticing though when creating a new room mailbox I get an error about "the mailbox was created but some properties could not be saved | cannot open mailbox /cn=Microsoft System Attendant"As the message says the mailbox is created OK, and it seems to work OK, but I still get this message every time I create a new resource. I've tried creating the resource via the EMS and that does NOT throw the error.I only have one 2013 server with one database so it is not an issue of the mailbox store hosting arbitration mailboxes being dismounted like I've seen a few...
This topic first appeared in the Spiceworks Community

Rock07,
I find a related link for your reference:
Event ID 12014 – Microsoft Exchange could not find a certificate
http://msexchangeguru.com/2011/06/22/event12014/
Disclaimer:
Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please make sure
that you completely understand the risk before retrieving any suggestions from the above link.
More details:
1. Run this cmdlet in Exchange management shell and copy the THUMBPRINT to a notepad:
Get-ExchangeCertificate |FL
2. Get-ExchangeCertificate -Thumbprint “A4530629717651BE6C4443FAC376F23412184CF3″ | New-ExchangeCertificate
Click Yes when prompted
3. Run Get-ExchangeCertificate |FL to get both new and old certificate Thumbprint.
4. Enable-ExchangeCertificate -Thumbprint 3A25CDB554EF6DDF81D32C2D54873DSF7FE54F71 -Services SMTP
Remember that this THUMBPRINT is the one for the new Certificate which we just created
and we are enabling it for SMTP
5. To remove old certificate, run Remove-ExchangeCertificate -Thumbprint A4530629717651BE6C4443FAC376F23412184CF3
Thanks
Mavis Huang
TechNet Community Support

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Database is running.
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SQL*Plus: Release 11.2.0.1.0 Production on Thu Dec 25 19:17:37 2014
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Enter password:
Connected to:
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With the Automatic Storage Management option
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STATUS
STARTED
Till here everything seems to be OK!!!!
When I log as oracle user. I check the followings:
[oracle11g@orcl11g ~]$ sqlplus sys as sysdba
SQL*Plus: Release 11.2.0.1.0 Production on Thu Dec 25 19:21:46 2014
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select status from v$instance
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3. When checking database as grid user it seems to be Database runnning... If running why it is not in OPEN state? What is running means here?
4. When I log on as oracle user and query v$instance, then error shown above occured. And also when startup the database then another error occured as in above. WHY?
5. When I edit /etc/oratab file manually why second row saved but the first one is changed after restart the system?
6. Normally, which user have to start, stop or manage database? I think that oracle user is necessary for managing database and the grid user is only for managing ASM and Oracle Restart.
PLEASE HELP ME TO SOLVE THIS CHAOTİC SİTUATİON!!!
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DBA_84

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Exchange 2013 "Could not open mailbox Microsoft System Attendant" room mailbox

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