Hello Everyone,

we're in coexistence between Exchange 2007 and Exchange 2013. All is good, except that we are not able to access E2007 Public Folders from external Outlook Anywhere users, which are members of more than 70 groups. These users can successfully access E2007 PF when connected internally. They can also successfully see PF contents from outside if they are members of less than 70 groups. Exchange 2013 is published via TMG, which is passing through authentication. According to several articles, we're hitting the limits of MaxTokenSize. We set this value on: Outlook clients, TMG, E2013 and E2007 with no success. We also set MaxPacketSize to 1 to avoid splitting authentication into multiple packets. We also tried increasing HTTP header size on Exchange servers and TMG with no success. Network Monitor does not show any failures.

Outlook error is shown when the user clicks on Public Folder link: "Cannot expand the folder. The set of folders cannot be opened. Microsoft Exchange is not available. Either there are network problems or the Exchange server is down for maintenance. (%DN of Exchange 2007 Server holding PF).

Any further advice will be much appreciated.

Best Regards,

Lubo 

Hi,

How about testing the issue via internal Outlook Anywhere ?

Thanks,

Hi,

Outlook Anywhere does not experience that issue when connecting internally

Best Regards,

Lubo