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Event ID: 10028 Source: MSExchangeIS

Source
Level
Description
Mapi session "/o=Messaging/ou=org_name/cn=Recipients/cn=user_name" exceeded half of the maximum of 32 objects of type "session".
Comments
 
cording to ME842022, this issue may occur if the following conditions are true:
- You have installed Microsoft Exchange Server 2003 Service Pack 1 (SP1) on the Exchange Server computer.
- A program that is running on a client computer opens many MAPI sessions to the Exchange Server computer. The number of MAPI sessions is larger than the permitted limit.
- You are using Microsoft Office Outlook 2007, and you add a large additional mailbox to your profile (for example, this issue may occur if the additional mailbox contains more than one thousand folders.)

See the article for the suggested resolution.

Another instance of this type of problem is described in ME980049:  This issue occurs because the Exchange 2010 Store limits the number of non-MAPI sessions that other services generate, such as IMAP, POP, Outlook Web Access, Microsoft Exchange ActiveSync (EAS), or Exchange Web Services (EWS). By default, sessions per user are limited to 32, and service sessions per user are limited to 16.
To resolve this issue, first determine whether this situation is caused by a different issue. If this is not the case, then increase the limit that your organization requires for non-MAPI sessions. See the article for details on how to do this.

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