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Single Mailbox opened in multipul Outlook clients. RRS feed

  • Question

  • Hello,

    Question:  How many users can open a single mailbox in Outlook?  We have a dept that is trying to have 4+ users open the same single mailbox and failing.  They say they can connect to this mailbox up to three users only.  The only time a fourth can connect is when one fo previous users disconnects.

    Any ideas where I can start looking?  Thanks!

    Shawn

    Friday, January 2, 2015 8:43 PM

Answers

  • Hi ,

    Please check the below mentioned links.

    http://blogs.msdn.com/b/pepeedu/archive/2010/01/13/exchange-2010-client-access-throttling.aspx

    http://blogs.msdn.com/b/exchangedev/archive/2011/06/23/exchange-online-throttling-and-limits-faq.aspx

    Note : For a checking purpose please disable the throttling policy which is applying for the problematic mailbox and check the same.


    Thanks & Regards S.Nithyanandham

    Saturday, January 3, 2015 9:29 AM
  • Hi,

    There is no exact limits on how many users can access one mailbox at the same time. But there is the maximum allowable sessions per user specified by Maximum Allowed Sessions Per User value. By default, sessions per user are limited to 32, and service sessions per user are limited to 16.

    If you want to modify the session limits, you need to modify them on all Mailbox servers within any database availability groups (DAGs). If you don't make the same changes on all servers, the results will be inconsistent. To increase the session limit on the Client Access server, the RCAMaxConcurrency value must be increased on the throttling policy. For more information, see Set-ThrottlingPolicy.

    For more information about this, please refer to:

    http://technet.microsoft.com/en-us/library/ff477612(v=exchg.141).aspx

    Regards,


    Winnie Liang
    TechNet Community Support

    Monday, January 5, 2015 9:24 AM

All replies

  • Hi ,

    Please check the below mentioned links.

    http://blogs.msdn.com/b/pepeedu/archive/2010/01/13/exchange-2010-client-access-throttling.aspx

    http://blogs.msdn.com/b/exchangedev/archive/2011/06/23/exchange-online-throttling-and-limits-faq.aspx

    Note : For a checking purpose please disable the throttling policy which is applying for the problematic mailbox and check the same.


    Thanks & Regards S.Nithyanandham

    Saturday, January 3, 2015 9:29 AM
  • Hi ,

    Just now i have found this link .

    http://www.msexchange.org/blogs/walther/news/so-you-still-have-issues-opening-many-shared-exchange-2010-calendars-using-outlook-2003-569.html

    Please check this too.


    Thanks & Regards S.Nithyanandham

    Monday, January 5, 2015 9:02 AM
  • Hi,

    There is no exact limits on how many users can access one mailbox at the same time. But there is the maximum allowable sessions per user specified by Maximum Allowed Sessions Per User value. By default, sessions per user are limited to 32, and service sessions per user are limited to 16.

    If you want to modify the session limits, you need to modify them on all Mailbox servers within any database availability groups (DAGs). If you don't make the same changes on all servers, the results will be inconsistent. To increase the session limit on the Client Access server, the RCAMaxConcurrency value must be increased on the throttling policy. For more information, see Set-ThrottlingPolicy.

    For more information about this, please refer to:

    http://technet.microsoft.com/en-us/library/ff477612(v=exchg.141).aspx

    Regards,


    Winnie Liang
    TechNet Community Support

    Monday, January 5, 2015 9:24 AM
  • Hi Shawn,

    Any updates?

    Regards,


    Winnie Liang
    TechNet Community Support

    Wednesday, January 7, 2015 2:08 AM