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maybe this can help....<br />
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<a href="http://forums.microsoft.com/TechNet/ShowPost.aspx?PostID=1137063&SiteID=17" rel="ugc nofollow">http://forums.microsoft.com/TechNet/ShowPost.aspx?PostID=1137063&SiteID=17</a>
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maybe this can help....

http://forums.microsoft.com/TechNet/ShowPost.aspx?PostID=1137063&SiteID=17 [http://forums.microsoft.com/TechNet/ShowPost.aspx?PostID=1137063&SiteID=17]

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Would I be making this change on the client or server end?
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Would I be making this change on the client or server end?

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Hey all...I know this is an old question. Alcatras...Can you tell me what values you set for the KeepAliveTime and KeepAliveInterval? Thanks.
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Hey all...I know this is an old question. Alcatras...Can you tell me what values you set for the KeepAliveTime and KeepAliveInterval? Thanks.

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Error message on Exchange Server:<br />
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Mapi session &quot;/o=&quot;sitename&quot;/ou=First Administrative Group/cn=Recipients/cn=end<wbr />.user&quot; exceeded the maximum of 100 objects of type &quot;session&quot;.<br />
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I have already increased the session limit from 32 to 100 hoping this would solve the problem. &nbsp;Interestingly, nobody in the main office, where the Exchange Server resides, is *ever* listed in the session limit exceeded messages, it is only the users in the remote firewall-based VPN tunnel site that experience the problem. &nbsp;Could there be something with the way the tunnel is communicating with our network that is causing the session timeouts to occur? &nbsp;There's no odd software installed or different type of computer system involved in the remote site versus the main site. &nbsp;So confusing!
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Error message on Exchange Server:

Mapi session "/o="sitename"/ou=First Administrative Group/cn=Recipients/cn=end.user" exceeded the maximum of 100 objects of type "session".

I have already increased the session limit from 32 to 100 hoping this would solve the problem.  Interestingly, nobody in the main office, where the Exchange Server resides, is *ever* listed in the session limit exceeded messages, it is only the users in the remote firewall-based VPN tunnel site that experience the problem.  Could there be something with the way the tunnel is communicating with our network that is causing the session timeouts to occur?  There's no odd software installed or different type of computer system involved in the remote site versus the main site.  So confusing!

Mapi Session Limit Exceeded only Over VPN Tunnel

A virtual private network (VPN) is a network that uses a public telecommunication infrastructure, such as the Internet, to provide remote offices or travelling users access to a central organizational network securely. VPNs encapsulate data transfers using secure cryptographic methods and other security mechanisms to ensure that only authorized users can access the network and that the data cannot be intercepted.

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.