Exchange 2003 and The token supplied to the function is invalid ID: 80090308

Problem:

When trying to open Public Folders in Exchange Admin I get the error

“The token supplied to the function is invalid ID”

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Form Required to View This Message Cannot be Displayed

When I use my calendar to create a new appointment I get the following error:

The form required to view this message cannot be displayed.
Contact your administrator.
Cause:
The Frmcache.dat file has become corrupted.
Solution:
rename the Frmcache.dat file located in the <windows>\forms directory. Then perform one of the following two procedures (A or B) to recreate the file. Then perform C.