Wednesday 25 June 2008

HMC 4.5 Released

Microsoft have just released there latest and greatest version of Hosted Messaging and Collaboration Solution the new version has some really good added features that will please hosters there is support for OCS 2007 as one of the major components to be added but also some added features for Exchange 2007 SP1 being supported like resource mailboxes and web based offline address books to give you option of moving away from having these sitting on the public folders servers if all of your users are running Outlook 2007.

Download and information above this release can be found on the new service provider website from Microsoft at

You will also be glad to here there is a migration kit on it's way to enable you to move from HMC 4.0 to 4.5 and directly from HMC 3.5 to 4.5 i will post more information about this when it becomes available.

Wayne Hollomby

Tuesday 3 June 2008

msExchMailboxFolderSet and HMC4.0 + HMC3.5 co-existence

If you are deploying HMC4.0 in co-existance with HMC3.5, and not a Greenfield install, then read on.

In co-existance when moving all POP, SMTP, IMAP and OWA urls(inc. Outlook Anyhwere/ RPC over HTTPs access) over to Exchange 2007 Hub Transport and Client Access Servers, be aware there is a bug if you have used OWA segmentation using the msExchMailboxFolderSet attribute.

More on Exchange 2003 OWA segmentation here:

The issue is if you use the value '4294967295' (FFFFFFFF) to set 'All Features' for Premium/Gold/'your full access mailbox type here'.

'FFFFFFFF' is read as -1, and Exchange refuses to allow POP3 and IMAP connectivity on the mailbox. Further the Exchange Management Console also flags the 'msExchangeMailboxFolderSet' as corrupt when selecting a user under 'Recipient Configuration \ Mailbox'.

Setting the value to '131071', as mentioned in the article, fixes the issue. (edit: there was an issue with this kb which has now been fixed, so additional notation on 131071 and 1310071 removed).
The way to fix this is to set the attribute to (null), or 131071 as mentioned in KB833340.

Other values that actually do restrict OWA use appear to not be affected.

This will also effect any ordinary enviroment that is in transition from Exchange 2003 to 2007 and is using the msExchMailboxFolderSet attribute in this way.

Oliver Moazzezi

MVP - Exchange Server