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Understand and change the forms cache size
By default, Outlook sets a limit of 2048 kilobytes (KB) for the maximum size of the forms cache. To change this setting, follow these steps:
1.On the Tools menu, click Options.
2.Click the Other tab, and then click Advanced Options.
3.Click Custom Forms. Under Maximum space on hard disk, type a number that is larger than 2048, and then click OK.
After you reach the maximum disk space that you set for the forms cache, Outlook purges the oldest unused form from the cache.
How Outlook 2007 uses the forms cache and how to troubleshoot forms cache problems
speechlysAuthor Commented:
thanks, i know how to change the setting client side, i want to change it by default in the registry!!
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IMO, the registry key looks impossible

From the above KB Article:
After you reach the maximum disk space that you set for the forms cache, Outlook purges the oldest unused form from the cache.

Note Outlook stores the size of the forms cache in the Frmcache.dat file. The format of the Frmcache.dat file is undocumented. Direct modification of the Frmcache.dat file is not supported. Therefore, you cannot programmatically change the size of the forms cache. Microsoft does not support direct modifications to any part of the contents of the Forms folder unless such changes are documented by Microsoft or recommended by Microsoft Product Support Services for troubleshooting only. Before you modify the contents of the Forms folder, you must first make a backup copy.

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speechlysAuthor Commented:
hi thanks for taking the time to reply, i get what your saying...but there must be a way to automate the increase of this setting.....surely it is only registry?
It looks like Outlook is not storing this setting from the GUI to any of the registry location

>> during the first launch of Outlook...these values are read and directly implemented to create\use the files...before even the registry-hives are read?

> I'm comparing this with the Outlook launch activity where the Outcmd.dat and few other temp files needs to be created and maintained through-out the Outlook's life\session
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