In Microsoft Outlook, along with the size limit of the PST (Personal Storage) file, there is an another limitation. You can not create more than approximately 16000 folders per PST file and more than approximately 16000 messages per folder. In might prevent you to store required data on the PST file. In order to sort out this problem, later versions of Microsoft Outlook such as MS Outlook 2002 and MS Office Outlook 2003 and 2007, offers a feature that is known as "Allow upgrade to large tables." This option increase the size limit of folders per PST file and number of items per folder. But in some situations, version incompatibility issues might take place after applying this feature and you may come across PST file corruption scenarios. Corruption to the Personal Storage file might render all of the data inaccessible and result into data loss. In these cases, you are required to go for PST Recovery solutions using appropriate tools.

The "Allow upgrade to large tables" is an extremely important and useful feature of Microsoft Outlook. This advanced feature is available for the Personal Storage files. "Allow upgrade to large tables" feature increases the limitation on number of personal or special folders in each PST file and the total number of items per personal folder in the PST file. This limit has been changed from almost 16,000 folders per file and 16,000 messages per folder to approximately 64,000 folders per file and messages per folder. You should always bear in mind that the upgrade is permanent. When you select this option of PST file, the headers of the file is updated permanently. You can not undone the changes, once you have updated.

The process of entering the properties of Personal Storage file and to upgrade for the "Allow upgrade to large tables" option is totally difference for both the CW (Corporate Workgroup) mode and the IMO (Internet Mail Only) mode installations of Microsoft Outlook. In order to make ""Allow Upgrade to Large Tables" option available for your Microsoft Outlook account, go to the suitable section, which is given below for required instructions.

Making the "Allow upgrade to large tables" feature available for Corporate Workgroup

In order to apply this feature in CW installation of Microsoft Outlook, go through below steps:

1-Open MS Outlook and select Services from the Tools menu.
2-Click for selecting the Personal Folder service and then click Properties.
3-In General tab, select the "Allow upgrade to large tables" check box and then click OK.
4-Restart Microsoft Outlook.

Making the "Allow upgrade to large tables" feature available for Internet Mail Only

In order to apply this feature in IMO installation of Microsoft Outlook, go through below steps:

1-In the list of Folders, right click to the Personal Folders and the click to select "Properties for Personal Folders" from the shortcut menu.
2-In General tab, select Advanced option.
3-Click for selecting "Allow upgrade to large tables" check box and then click OK and OK.
4-Restart Microsoft Outlook.

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