Running Exchange 2007 Enterprise 64 bit SP3 on my Windows 2003 R2 Enterprise SP2 server Clients are Outlook 2003 to 2010 Getting this message all of a sudden Type : Warning Date : 3/28/2012 Time : 4:48:14 AM Event : 10028 Source : MSExchangeIS Category : General User : N/A Computer : TGCS005 Description: Mapi session "/o=XXXXXXXX/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=TestUser" exceeded half of the maximum of 16 objects of type "session". Never saw thias before now all of a sudden I see this message over and over again Email is working able to access all folders and receive and send I logged out and then back on no change Any ideas? Thanks Tom Thomas R Grassi Jr

explained in kb article http://support.microsoft.com/kb/980049/en-us

Hi Tom, To change the value of the maximum permitted MAPI sessions per user from the default, you can configure the Maximum Allowed Sessions Per User registry entry. To do this, follow these steps. 1.Click Start, click Run, type regedit in the Open box, and then click OK. 2.Locate and then click the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem 3.If the Maximum Allowed Sessions Per User entry does not exist, do the following: On the Edit menu, point to New, and then click DWORD Value. Type Maximum Allowed Sessions Per User as the entry name, and then press ENTER. 4.Right-click the Maximum Allowed Sessions Per User entry, and then click Modify. 5.Click Decimal, type the value that you want to set in the Value data box, and then click OK. 6.Exit Registry Editor. 7.Click Start, click Run, type services.msc in the Open box, and then click OK. 8.Click the MSExchange Information Store service, and then click Restart Service. Additionally, please refer to below KB: http://support.microsoft.com/kb/842022 Thanks.Rowen TechNet Community Support