- 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.
Note A hexadecimal value of 0x20 converts to a decimal value of 32.
If the issue occurs because a large mailbox was added to a Cached Exchange Mode profile in Outlook 2007, you can disable the new Outlook 2007 default feature that causes this issue. To do this, follow these steps.
Note When you follow these steps, you cannot access the shared mailbox folders while you are working offline by using your Cached Exchange Mode profile.
- On the Tools menu, click Account Settings.
- Click the Exchange Server account, and then click
- Click More Settings.
- On the Advanced tab, click to clear the
Download shared folders (excludes mail folders) check box.
- Click OK, click Next, and then click Finish.
- Obtain a fix
- Grant View Information Store Status permissions to the account under which the program runs
Note Programs that run under an account that has these permissions are not affected by the MAPI sessions-per-user limit.
- In Exchange System Manager, right-click the Exchange Server object or the mailbox store to which you want to grant the permissions, and then click Properties.
- Click the Security tab.
- Click the account to which you want to grant the permissions.
If the account is not listed, click
Add, click the account name, click Add, and then click OK.
- Under the Allow column, click to select the View information store status check box, if this check box is not already selected.
- Click to clear the check boxes for any permissions that are not required, and then click OK.
Note You may have to follow this step if you clicked
Add to add the account in step 3. This is because every check box in the Allow column was selected when you added the account in step 3.
If this issue occurs after you install the Scalable Networking pack or Windows 2003 Service Pack 2, see the following article in the Microsoft Knowledge Base:
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
- Click Start, click Run, type regedit in the Open box, and then click OK.
- Locate and then click the following registry subkey:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem
- If the Maximum Allowed Sessions Per Userentry 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.
- On the Edit menu, point to
- Right-click the Maximum Allowed Sessions Per User entry, and then click Modify.
- Click Decimal, type the value that you want to set in the Value data box, and then click
- Exit Registry Editor.
- Click Start, click Run, type services.msc in the Open box, and then click OK.
- Click the MSExchange Information Store service, and then click Restart Service.
Article ID: 842022 - Last Review: May 1, 2009 - Revision: 1