Wonder if the user had mail rules and deleted them without disabling them first.   Read this technote.   It contains an agent to cleanup the mail rules,

http://www-01.ibm.com/support/docview.wss?uid=swg21088058

I still dont get it where to find  "Calendar Profile" as stated in link you give. I already open notespeek and user database

In Notespeek, the CalendarProfile would be found under Profiles as calendarprofile.  You will see $FilterFormula, $FilterFormulaCount, and $FilterFormula_0, etc. A rule that says not to accept the message if the following conditions are met will look like this: 

name    "$FilterFormula_7"
type    Formula
class    Formula
flags    Summary
length    230
value    {CondSender_C := @LowerCase( @Name([Abbreviate]; @Unique( From:Principal:SMTPOrigi}
    {nator ) ) ) ; @If(( ( @Contains( CondSender_C ;"uce@spam.com")) ) ; }
    {(@Do((@DeleteDocument))); "" )}

The above says that if mail is received from uce@spam.com, delete the message. 

While NotesPeek doesn't provide a means to remove the hidden rule, it is useful for confirming whether there are one or more rules that may be acting on messages. IBM provides a tool that, among other things, can remove mail rules selectively. It also has a section for removing profiles such as the Calendar Profile. A link to this tool is available here:  http://www-01.ibm.com/support/docview.wss?uid=swg21459332

I got this value for my filter formula.

name    "$FilterFormula"
type    Formula
class    Formula
flags    Summary
length    20
value    {@false}

The user currently got one active rule which name "$FilterFormula_1" and user "$FilterFormulaCount" as shown below

name    "$FilterFormulaCount"
type    Text
class    Text
flags    Summary
length    1
value    2

If every rule is accounted for, that is, you see one visible rule, then I would try removing the CalendarProfile.  I would make screenshots of the user's current settings shown under Calendar Preferences so that the choices can be recreated later.