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Exchange 2013 - after migration 3rd party MAPI app fails reading from shared calendars

Hi fellow Experts ---- I've got this strange issue eating away my holidays

We have a 3rd party applications that collects data from team members calendars. The application works as this:
- each team member enters codes i Subject and location in calendar
- the team leader uses this application to gather statistics
- statistics are gathered in Excel
- this worked like a charm with 2007 and 2010 - did a migration to 2013 it fails
- this is how the error is experienced
- it SOMETIMES fails, works sometimes during off hours
- it fails on random calendars from time to time
- it gives an error "missing pernmission on calendard: USERNAME ?" --- but permissions are set correctly
- the logs in Exchange gives (i'm not sure if it matters)
 
MapiExceptionNoAccess] Unable to create folder. (hr=0x80070005, ec=-2147024891)

exchange max connections exceeded (This one we've increased)

[MapiExceptionInvalidParameter] Unable to obtain the FID and MID

2013-06-28T21:20:31.011Z,22228,120,/o=XXXXXXXXXX/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=XXXXXXXXX,,OUTLOOK.EXE,15.0.4505.1000,Cached,,,,ncacn_http,Client=MSExchangeRPC,,,,-2147024891 (rop::AccessDenied),00:00:00.0310000,,"RopHandler: OpenMessage: [AccessDeniedException] The process failed to get the correct properties. ->
[MapiExceptionNoAccess] Unable to get properties on object. (hr=0x80070005, ec=-2147024891)  

2013-06-28T21:20:03.087Z,29807,142,/o=XXXXXXXXX/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=XXXXXXXXXXXXXXXXXX,,OUTLOOK.EXE,14.0.6131.5002,Classic,,,,ncacn_http,Client=MSExchangeRPC,,,DelegateLogon,1144 (rop::WrongServer),00:00:00,"Logon: Delegate, /o=XXXXXXX/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=user6e144ff0 in database Mailbox Database 1112390154 last mounted on XXX-EX-02.XXXXX.ad at 27.06.2013 10:56:18, currently Mounted",RopHandler: Logon: ,
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Jakob Digranes
Asked:
Jakob Digranes
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1 Solution
 
Imtiaz HashamCommented:
I had a similar problem and the issue was the MAPI client needed to understand the new Free/Busy Schedule in the calendar.

I couldn't do sharing and for that reason, we needed an Outlook 2013 account to manage the issue!
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Jakob DigranesSenior ConsultantAuthor Commented:
Forgot this Question ...
here's what fixed it for us:
Created new ThrottlingPolicy with RCAMaxConnections = 70 and added it to all mailboxes needing to do search

http://technet.microsoft.com/en-us/library/jj150503%28v=exchg.150%29.aspx
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Jakob DigranesSenior ConsultantAuthor Commented:
worked changing connections policy
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