Today the Exchange Team released Rollup 13 for Exchange Server 2007 Service Pack 3 (KB2917522). This update raises Exchange 2007 version number to 8.3.348.2.

This Rollup introduces the following fix:

• 2926397 An Edge Subscription file from an Exchange 2013 Edge Transport server is rejected by an Exchange 2007 Hub Transport server

This Rollup also adds support for using Windows Server 2012 R12 domain controllers in your Exchange 2007 SP3 RU13 environment; it does not add support for running Windows Server 2012 R2 forest or domain functional levels.

Notes:

• When running ForeFront Protection for Exchange, make sure you disable ForeFront before installing the rollup and re-enable it afterwards, otherwise the Information Store and Transport services may not start. You can disable ForeFront using fscutility /disable and enable it using the fscutility /enable command;
• If you want to speed up the update process for systems without internet access, you can follow the procedure described here to disable publisher’s certificate revocation checking;
• Rollups are cumulative, i.e. they contain fixes released in earlier update Rollups for the same product level (RTM, SP). This means you don’t need to install previous Rollups during a fresh installation but can start with the latest Rollup package.

As with any Hotfix, Rollup or Service Pack, I’d recommend to thoroughly test this rollup in a test and acceptance environment first, prior to implementing it in production.

You can download Exchange 2007 SP3 Rollup 13 here.