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It happens after SP 2 Installation.
Users started to receive meetings directly to their calendars without accepting .
I used Microsoft ExBPA in order to see if there is any problem and discovered that The site-wide public folder database for administrative group ‘Group Name’ has been deleted. .
And followed MS Instruction on how to recreate folder back.

1. Open an Active Directory editor, such as ADSI Edit.
2. Locate the public folder information store you want to designate as the Site Folder Server, by expanding the     following nodes in the Configuration container:CN=Configuration,DC=<DomainName>,DC=com, CN=Services, CN=Microsoft Exchange, CN=<OrganizationName>, CN=Administrative Groups, CN=<AdministrativeGroupName> CN=Servers, CN=<ServerName>, CN=InformationStore, CN=<StorageGroupName>
3. Locate the public folder information store you want to designate as the Site Folder Server, by expanding the     following nodes in the Configuration container:
4. In the right pane, right-click CN=<PublicFolderStoreName>, and then click Properties.
5. In the Attributes field, scroll down and select the distinguishedName attribute.
6. Click Edit, and then copy the entire attribute to the Clipboard.Expand the Configuration container, and then expand CN=Configuration,CN=<DomainName>,CN=com, CN=Services, CN=Microsoft Exchange, CN=<OrganizationName>, CN=Administrative Groups
7. Right-click the administrative group you want to modify, and then click Properties.
8. In the Attributes field, scroll down and select the siteFolderServer attribute.
9. Click Edit, and then paste the value for the distinguishedName attribute into the Value field.
10. Double-check the contents of the Value field to ensure the paste was performed correctly, and then click OK to save the change.
11. Click OK to close the Administrative Group properties.
12. Exit the Active Directory editor and restart the Microsoft Exchange Server Information Store service on all Exchange Server computers in the site for the change to take effect.

The full article http://technet.microsoft.com/en-us/library/aa996485.aspx

Additional resources:

http://support.microsoft.com/kb/943721

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